Posts Tagged ‘pellet guns’
Quackenbush .25 pistol: Part 2
by B.B. Pelletier
Test data and photos by Earl “Mac” McDonald
Nobody played!
First of all, we got no answers on last Friday’s question at the bottom of the blog. The answer is: it’s a catapult gun, and it shoots steel BBs. It was offered by the same company that built the Johnson semiautomatic rifle that was used as an alternative by the Marines in World War II, but at the price of $15 in 1948, it never stood a chance.
Today, we’ll shoot the Quackenbush .25 pistol for velocity and accuracy. There was a surprising amount of interest in this pistol, though much of the talk took place on Pyramyd Air’s social network sites. But even here, many readers know about this airgun. Just as a reminder, this isn’t a fire-breathing PCP. It’s a CO2 gun that uses the same stock valve as a Crosman 2240.
This pistol bloops them out at less than 400 f.p.s. because it’s a .25 and shooting pellets far heavier than the valve was designed to handle. Mac says he loves watching them arc out through the scope and drop through the aim point at the last instant. When the sun is behind you, it can be quite a show.
Velocity
We’ll start with the velocity first. A couple of readers guessed that this pistol would shoot under 400 f.p.s. and they were right. The fastest average velocity Mac recorded came from Diana Magnum pellets — an obsolete brand that used to be the best .25 caliber pellet on the market. Until now, Mac has found that it shot best in this pistol. Although Diana Magnums came in both 20- and 21-grain weights (they varied over time), Mac says these weigh an average 19.90 grains, so these are the lighter ones.
Because this is a CO2 gun, Mac had to allow for cooling — so he waited 15 seconds between each shot. That allows the gun to warm up. He also replaced the CO2 cartridge after 24 shots, even though he says the gun gets up to 40 shots per cartridge. That gave every pellet the best chance to perform.
Mac recorded an average 378 f.p.s. with this pellet. The total spread was 7 f.p.s., which is pretty tight for such an inexpensive airgun . At the average velocity, this pellet generates an average 6.32 foot-pounds of energy at the muzzle. Because this is a gas gun, it’s probably going to get more energy from heavier pellets.
Next up was the Beeman H&N Match wadcutter pellet. Weighing 21.6 grains, they averaged 370 f.p.s., with just a three foot-second spread. The muzzle energy was 6.57 foot-pounds.
Mac upped the ante with one of the two new .25-caliber pellets. The Benjamin dome weighs 27.8 grains, so it’s a heavier pellet in this caliber. It averaged 323 f.p.s. with a 7 f.p.s. total spread. The muzzle energy was 6.44 foot-pounds, so less than you would predict; but because it’s a Benjamin pellet, there’s antimony in the alloy, and that may slow it down just a little.
I told Mac that this pellet and the next one are the two most accurate .25-caliber pellets on the market. I expected both of them to beat the Diana Magnum in his pistol.
The final pellet he tried was the new JSB Exact Kings that weigh 25.4 grains. This is the other very accurate pellet that Mac tested. It averaged 346 f.p.s. and generated an average 6.75 foot-pounds. The total velocity spread was 9 f.p.s.
Okay, now the velocity testing is out of the way, and what do we have? The pistol averages under 400 f.p.s. but over 6 foot-pounds of energy. So, it isn’t a weak air pistol. Slow, perhaps, but not weak. So, how does it shoot?
Accuracy testing
Mac shot the pistol at 25 yards. I asked him to shoot 10-shot groups instead of the five he used to shoot with this gun. That made a difference in the group sizes, of course. But another dynamic emerged during testing that I think you’ll find very interesting. I’ll explain it as we go.

Ten shots at 25 yards. Believe it or not, the first four shots are all strung apart from the main group, where the last six shots went. Group measures 2.16 inches between centers.
Do you see the dynamic? The group forms around the final shots. Mac did “season” the bore between targets with two shots from each new pellet; but, even so, the pellets walked into the group at the end of each 10-shot string. I suggested to Mac that this might be due to seasoning the barrel, but he thought it was because the gun cooling down as it was shot.
The heavy JSB Exact Kings were next up. Mac found them to also string vertically for the first three shots, then bunch together at the end, just like before.

Ten JSB Exact King domed pellets made this 1.09-inch group at 25 yards. The first three shots are vertical, then the final seven are bunched together below. There’s one straggler out to the right, but this is a much better group than the wadcutters produced.
Thus far we have seen an interesting dynamic of the pellets moving to a place, then grouping tightly. So how do the formerly most accurate Diana Magnums react? They’re next.

The Diana Magnum pellets didn’t act like the first two pellets. They all landed at the same height on target, without an vertical stringing. Group size was 1.09 inches between centers.
The Diana Magnums don’t seem to follow the same pattern as the first two pellets. I don’t know why that would be, but that’s what the target shows. As with all other pellets, Mac seasoned the bore with two shots before this group was fired. Let’s go to the final pellet and see what happens.

The Benjamin domes gave the smallest group of ten shots at 25 yards. Group measures 0.85 inches between centers. Again, we see a vertical orientation to the group; though, this time, Mac didn’t indicate that the final shots were all bunched together in the large hole.
The results
There you have it. That’s what this Quackenbush .25 can do.
In my opinion, Mac should pick just one pellet — the Benjamin dome — and shoot nothing else in this gun. I think the tighter groups at the end are due to seasoning the bore; because in my other testing, I’m starting to see very similar results. But even if that isn’t what’s happening here, the Benjamin dome is still the accuracy champ.
Is the Quackenbush conversion a good thing for a Crosman 2240? If you want a .25-caliber air pistol and you don’t want to get into high-pressure air, then I guess it is. You must accept the low velocity, while realizing that this pistol is still a good deal more powerful than a Beeman P1. And because it’s launching very heavy pellets, it retains more of that energy longer downrange, so things keep getting better the farther the target is from the muzzle — within reason.
This much is certain — people love tinkering with their Crosman airguns, and Dennis Quackenbush has provided the means to do that for over a decade and a half. This may not be the only game in town, but it’s certainly one of the very best.

The Quackenbush .25-caliber conversion is a neat way to customize your Crosman 2240.
Quackenbush .25 pistol: Part 1
by B.B. Pelletier
Test data and photos by Earl “Mac” McDonald
Back in the 1990s, Dennis Quackenbush made a nice part of his living by modifying single-shot pistols from Crosman. In those days, there weren’t as many places to buy aftermarket parts, and Crosman didn’t have a custom shop. In fact, when Dennis and I were seated with Crosman’s CEO at an NRA Airgun Breakfast at the 2001 NRA Annual Meetings and Exhibits in Kansas City, Missouri, we introduced ourselves and he asked both of us what we did. Dennis told him that he made his living modifying Crosman single-shot pistols. “You sell them (the SSP 250) for $39 and I modify them for $125. I can’t keep up with all the work!”
To say the man was stunned is an understatement. I don’t think he believed Dennis, because he restated what Dennis had said, “You mean people pay you $125 to modify a gun that sells for $39?” You could hear the disbelief in his voice.
That man didn’t remain at the reins much longer. And his replacement, Ken D’Arcy, instituted the Crosman Custom Shop a few years after he stepped in. But that did not diminish the number of aftermarket places that modify Crosman airguns and make parts for owners to install. If anything, the number of places increased, though I would not say that it was in response to the Crosman Custom Shop starting up. But it was and still is a direct result of the openness of the Crosman Corporation toward their customers, by providing parts and information that support their guns.
For several years, one of the most popular modifications Dennis made was a steel breech for the Crosman 2240 single-shot pistol. Not only is it stronger and more rigid, it also allows for the installation of a scope — something that most home tinkerers will want to do. And Dennis switched the bolt handle to the left side for right-handed shooters, because they want to continue to hold onto the pistol while they load it. People who don’t shoot these pistols don’t understand that desire, but it only take 15 minutes with one and you understand completely. That one change may have been his greatest contribution, because it showed everyone what a little thought can do to enhance the operation of an inexpensive airgun!
Many of the handguns Dennis built on Crosman frames are righteous thumpers, with power levels far beyond anything Crosman ever envisioned. Dennis has made several guns on this 2240 frame that achieved 100 foot-pounds of energy at the muzzle, and I’ve personally witnessed one that produced 300 foot-pounds. So, like the modern AR, there’s no limit to what you can do with one of these flexible air pistols.
But in this report, we’re going to look at something a little closer to the original gun. It’s a .25-caliber pistol that has the steel receiver from Dennis and a 10.5-inch barrel that he rifled. In terms of power, it’s been left pretty close to original; so it gets a decent number of shots. Because of the large caliber, they don’t go very fast.

The Quackenbush .25-caliber pistol is built on a 2240 frame. It has a steel receiver, and the bolt is on the left side for easier loading.
There are no open sights, as Dennis envisioned owners would want to scope the gun. The receiver has an 11mm dovetail cut into the top. Since the frame is from a 2240, it readily accepts an add-on carbine stock that so many shooters seem to prefer. Certainly, when you put a heavy rifle scope on the pistol, the stock is the best way to go!
Mac reports that the pull length with the carbine stock is 16.3 inches, but the angle of the grip makes it feel shorter. He says it fits him well, and he usually likes a rifle with a pull length of 13 inches. I looked at the pictures he sent and see that the scope hangs back behind the receiver on this gun. That may be why the long pull doesn’t feel so bad. Also, the gun is very light, at only 48 oz. in the scoped pistol configuration, so there’s not a lot of weight hanging out front. The shoulder stock adds another 13 oz.

The optional shoulder stock is something nearly all pistol owners have.
Dennis didn’t number all of the guns that he made, but partway through the production he began to put his own serial numbers on them. His last gun carried the number 850. Mac’s pistol is numbered 509.
Though Dennis no longer makes complete guns, according to his website he still does make the parts for them so owners can modify their own guns. The velocity of the .25-caliber pistol is approximately the same as the 2240 that it was modified from when shooting a 14.7-grain .22-caliber pellet.
The features of this modification are:
Steel barrel, receiver and bolt
The barrel is threaded into the receiver
The transfer port is in the breech instead of the barrel
The new steel bolt is larger than the pellet
The bolt contacts the pellet’s skirt — no probe is used
The pistol is 14 inches long without the shoulder stock, and 26 inches in the carbine configuration. The trigger-pull is a repeatable 43 oz., though some may find the trigger blade a bit too thin for comfort. The scope you see here is a cheap Simmons that Mac thinks was probably a rimfire scope at one time. It has a one-inch tube and fixed 4x magnification. The 32mm objective lens has a fixed parallax that Mac adjusted to 25 yards by turning the lens locking ring.
While many .25-caliber single-shots produce lots of muzzle energy, this isn’t one of them. Those guns are modified into PCPs, where this one is still a CO2 gun. It gives you a taste of a larger caliber without all the extra fuss and noise that a magnum blaster would have.
Mac tells me this pistol is quite accurate, and he loves the way it lobs them in. Next time, we’ll combine Parts 2 and 3 for a good look at the performance of this vintage Quackenbush airgun.

With the longer barrel and no open sights, this pistol looks slicker than the 2240 it was modified from.
Safe backstops and bullet traps
by B.B. Pelletier
Many of us shoot our airguns inside the house, garage or barn and need to stop our projectiles from damaging what’s behind the target. Today, I want to talk about what works, what doesn’t and why. My sermon today is in the form of a repentant sinner, because I’ve made most of the mistakes I’m telling you to avoid.
The difference between a trap and a backstop
A bullet trap is designed to stop whatever is shot into it. Targets are hung in front of the trap, and it’s expected to stop all bullets/pellets/BBs that enter.
A backstop is often set behind the trap to stop the bullets that miss the trap. If there’s a trap, the backstop is only called upon occasionally; but sometimes there’s no trap — just the backstop, in which case the backstop, alone, has to stop everything.
Starting with BB guns
When I was a boy, the most popular trap for BB guns was a trash can or wastepaper basket filled with crushed newspapers. It worked, but not for very long, so let’s talk about that. Crushed newspapers are great padding for packages. The newspapers have enough resiliency to keep the contents of the package firmly in place — unless those contents are very heavy. And the same crushed newspapers will stop BBs from low-powered BB guns — like Red Ryders — for a short time.
But — and this is important — even a Red Ryder will eventually shoot through the crushed newspapers when one BB after another impacts in the same spot. And, if the BB gun is more powerful, it doesn’t take as long to tear through. Red Ryders shoot at around 300-350 f.p.s. But some powerful BB guns like the Remington AirMaster 77 top 700 f.p.s. They’ll rip through crushed newspapers in one-tenth the time it takes a Red Ryder to get through. When you’re making a BB trap, consider both the length of time you’ll be shooting at the trap as well as the potential velocity of the gun doing the shooting.
A better way to stop BBs is to provide a backstop that has some give — like a piece of wall-to-wall carpet. When the backstop moves, it robs the projectile of a lot of velocity, which prevents bounceback — the bane of the BB gun. And wall-to-wall carpet has a very tough base that seems impervious to steel BBs at Red Ryder velocities. I know of clubs that have made BB gun ranges with large sections of wall-to-wall carpet that not only stop the BBs but which hang to the floor and are folded into a trough at the bottom to funnel all the BBs into a container, simplifying cleanup. A backstop like that and a large powerful magnet makes cleanup an easy chore.
Of course, you can buy a commercial BB trap that will do all I’ve described. Crosman’s model 850/852 trap is perfect for low-velocity BB guns and works for low-velocity pellets, as well. The only problem is that Crosman has them made in China, and sometimes they’re out of stock for a very long time. The UTG pellet & BB trap is very similar and will do the same things. It costs a few dollars more, but the supply is more regular. Both of these traps have “ballistic curtains” that absorb the energy of BBs at low velocity. A thin steel backplate ultimately stops the projectile. Of course, you’ll want to put a larger backstop behind this trap for those few projectiles that miss the trap altogether.

This Crosman 850 BB trap has stopped thousands of BBs and pellets. Notice how the ballistic curtains have been torn up from all the shots.
For the more powerful BB guns — those with muzzle velocities over 400 f.p.s. — I don’t like carpet. Like crushed newspaper, it’s possible to shoot through it if you keep hitting in the same spot. For those guns, I prefer an actual trap filled with duct seal and use the carpet as a backstop behind the trap. The few BBs that hit the carpet won’t hit in the same place, and it should work fine. If the range is to be more permanent, however, put some plywood behind the carpet and keep an eye on the carpet and replace it as needed.
On to pellets
Pellets are made of lead, mostly, though there’s a movement to use other metals that are less toxic. Lead absorbs energy when it deforms against a hard target. Up to 600 f.p.s., lead continues to flatten out until a spent pellet has become a flat round disk with just a trace of the skirt still visible. At velocities above 600 f.p.s., lead starts to break apart upon impact. First, it breaks off in large chunks traveling at low velocity. As the impact velocity continues to rise, the lead fragments get smaller and travel faster. Above 700 f.p.s., they’re traveling fast enough to break lights up to 15 feet away from the trap.

This pellet was flattened at 600 f.p.s. or less, You can still see the pellet’s skirt, including the rifling that’s engraved into both it and the head that is flattened.

This pellet was moving faster than 600 f.p.s. when it hit and has started to break apart. It’s a smaller caliber than the first pellet, but the breakup happens in the same way regardless of size.
You don’t want to use a lightweight pellet trap for pellets that move at higher velocities! They’ll even punch through steel plates if they’re thin enough. For pellet guns, some thought must be given to what kind of trap you use.
I use three traps in my work. One is the BB trap already mentioned. Regular readers of this blog know that I shoot several hundred rounds each week. Often one test involves from 100 to 200 shots. So, my traps (I’m not talking about backstops yet) have to be up to the task.
Heavy Duty Bullet trap
For all my most powerful airguns, I use a Heavy Duty bullet trap designed to stop a .22 long rifle bullet. I bought mine about 20 years ago and I thought $45 was a lot to pay. Today, you’ll pay over $75 for the same thing, but it’s the last bullet trap (of that type) you’ll ever buy. My trap has seen hundreds of thousands of pellets and bullets over the years — and except for the paint, it’s still as good as new today.
My workhorse heavy-duty pellet trap hides behind the cardboard facer. The white backer board behind is half an inch thick and will stop pellets with up to 50 foot-pounds of energy.
This is the trap I use when I shoot 25 yards inside the house, and over the years I’ve missed this trap a couple dozen times, so I learned long ago to back it with something strong. I use a board of white synthetic material that Edith gave me years ago. It’s supposed to be a special board she bought over 15 years ago for kneading bread dough, but it warped just enough that it twirls and moves freely on the countertop during use, so now it’s mine. Since I started using this backer board with the steel trap, nothing has slipped past.
The final trap I use is the one that blog reader Jim Contos gave me. I wrote a special blog describing how to build one for yourself. Jim gave me this trap after I reported shooting through my homemade silent pellet trap that I’d used for many years. After cleaning the trap and replacing all the duct seal, I was testing a Beeman HW100 S FSB, which is a 26 foot-pound PCP rifle. Within just a few shots I shot clean through the duct seal and the steel plate behind it! I’ve used this trap for a very long time and with some powerful airguns. What was different this time was the lack of a wadded mass of lead pellets to help slow the pellets that were shot. So they sailed right through the trap!

This is what happens when a 26 foot-pound pellet rifle hits two-inches of duct seal in the same place repeatedly. There’s a thin steel plate between that plywood back and the duct seal, and the pellets zipped through it!
I don’t back this trap with anything. because I use it only for chronograph testing, where the muzzle is a foot from the trap. I haven’t come close to missing the trap in over 25,000 shots!
How large should the backer be?
Make the backer large enough to positively stop all rounds that are shot in the direction of the target. If you’re the only shooter, maybe the backer can be smaller; but if your range will ever host other shooters of varying abilities, make it bigger. When we lived in Maryland, I often let others shoot on my basement range. I used a 3/4-inch plywood backer that was 4 feet square. Even then it was just enough to stop all the wild shots. Not everyone waits to sight the gun before their finger moves to the trigger!
Let’s review
So, you always want to stop your projectile positively. Sometimes that’s done with just a target backer, like a piece of wall-to-wall carpet. Other times, you use a trap to stop the projectile and put the backer behind it in case you miss the trap.
Shooting safe is imperative, because there’s no room for error here. How you stop your projectiles makes all the difference between a safe home range and a serious accident or injury. This is one area where you always want to err on the safe side!
Crosman 2100B multi-pump air rifle: Part 3
by B.B. Pelletier

Crosman’s 2100B is a full-sized multi-pump that hopefully delivers power and accuracy with a few economic concessions.
Blog reader J was alert and noticed that I had not yet done the accuracy test of the Crosman 2100B multi-pump. I was astonished to find that he was right, so today we’re going to look at it. But before we do, I want to show you something I did at the range last week. Some of you who have been reading for a long time will remember that over a year ago I was suffering from eye problems. It turns out that my diabetes had dehydrated me so much that my eyesight was affected. And it took a long time for the situation to correct itself. I wondered if I would ever be able to shoot with open sights again.
This past Thursday, I was out at the range testing several firearms and airguns and a friend of mine happened to bring his Remington RangeMaster model 37 .22 rimfire target rifle for me to try. The model 37 was Remington’s equivalent to Winchester’s model 52 target rifle until the model 40X was created, and it (the model 37) has the reputation of being incredibly accurate. My friend can no longer use open sights and is scoping all the rifles he intends to keep. But this one is a rifle he has owned for decades but never shot. It still has the factory non-optical target sights.
The Lyman 17A front globe has a post-and-bead like target shooters used back in the 1930s and earlier. You put the post at the 6 o’clock spot on the bull. With good eyes, this kind of sight is considered second only to a properly sized aperture front sight out to 200 yards, and world records have been set with it. But notice I said, “With good eyes.”
I shot it at 50 yards with Winchester Super-X high-speed ammo, which is hardly target ammo! When I saw the group made with five shots I was ecstatic, because it proves that I can still see good enough to use open sights. I stopped at only five shots because who wants to ruin a group like that? However, after an involved trade with my friend, I ensured many more years of shooting this 37, and eventually I will shoot 10-shot groups. That’s important for today’s report, because the Crosman 2100B has a square post-and-notch sight, and the front has a bright green fiberoptic bead.

Five shots in 0.30 inches at 50 yards with open sights! The old man can still see! Sorry about the over-exposure.
Next, I tried my custom .17 HM2 that this same friend made for me on a Mossberg 44 US action. This rifle has a Leapers scope, so there’s an even better chance of hitting the target. This time, five shots went into 0.266 inches at the same 50 yards. I was on fire! Unfortunately, I haven’t yet mounted the scope on the FWB 300S, so I didn’t have that to test, but everything I shot that day went where I wanted. Since I couldn’t see the group through my scope, I knew it was a small one. And, once again, I chickened out after 5 shots. If I were reporting on the guns and shooting for the record, I would have shot 10 shots with each gun.

Five shots in 0.266 inches at 50 yards with a scope. Not that much better than open sights. It looks better because the .17-caliber bullet is smaller, but the actual size of the group isn’t that much less than the first group.
On to today’s test
I decided to begin shooting pellets with the 2100 at 10 meters. That way, if the rifle proved somewhat inaccurate, I could still keep them inside the trap. The 2100 has a .177 rifled barrel, so pellets should be more accurate than the steel BBs it also shoots. Since this is a Crosman rifle, what better to begin than with 7.9-grain Crosman Premier 7.9-grain domes?
The first thing I did was oil the pump head with several drops of Crosman Pellgunoil. I did that for the velocity test, as well; but since it’s impossible to overdo this step and it does ensure the best compression, I did it again.
I decided on 5 pumps for this test because the velocity test showed that was enough to get all pellets into the 500 f.p.s. range. At 10 meters, that’s all you need for good results. So, this test was very easy on me.
A new way of loading
Many owners may already have discovered what I am about to share; but while I was shooting the Premiers, I discovered a foolproof way of loading them. The loading port on the side of the rifle is too small for most adult fingers, and until now I’ve found it difficult to load the pellet so the head points forward. But during this test, I accidentally discovered that I could drop in a pellet in any attitude and simply elevate the muzzle of the rifle with the receiver rotated to the left so the loading port is angled up. The pellet would then try to right itself at the bottom of the loading channel; and, if it wasn’t aligned, all I had to do was push it forward slightly with the cocking handle and then pull the handle back and the pellet would align itself every time. I tried this with the JSB Exact RS pellets, as well, but they got stuck and didn’t align as easily as the Premier lites. I can’t wait to try this method on my old Crosman 2200.
Sights are okay, but not great
I found the sights easy to acquire and very sharp and crisp, but the method of adjustment leaves a lot to chance. I never did get the group shooting where I wanted it. Also, though I elevated the rear sight nearly all the way, it was still just hitting at the point of aim at 10 meters. Forget about shooting longer distances unless you learn how to hold the front post above the top of the rear notch. But the sights are not important, because this will not be the last test of this rifle. Just like the M4-177 rifle I tested last year, I found the 2100B was far more accurate than the price indicated! In a word, it was phenomenal — which is why I told you about the state of my eyes in the beginning of the report.

Ten Crosman Premier lites went into this 10-meter group that measures 0.539 inches. This is fantastic accuracy for an inexpensive multi-pump with fiberoptic sights.
Next, I tried the JSB Exact RS pellet. I was expecting to see a similar group, which is why what I got surprised me so much.

Ten JSB Exact RS pellets made this huge 10-meter group that measures 1.05 inches. This is obviously not the pellet for this 2100!
What a difference! Crosman could use this as an ad testimonial for Premiers, if they wanted. We all know that the JSB Exact RS is a premium pellet; but in this rifle, the Premier lite is the clear and obvious choice. I already demonstrated that my eyes are up to the task, so there’s nothing to blame in this case but the pellet.
BBs next
After testing two pellet brands, I switched to Crosman Copperhead BBs and fired 10 from a standing supported position at 22 feet. If the group was small, I would then try other brands of BBs, but as you will see that wasn’t necessary.

Ten Crosman Copperhead BBs went into this 2.219-inch group at 22 feet. This demonstrated that it wasn’t worth pursuing BBs any further. My photo inadvertently cropped off a BB hole on the right of the group. It’s on the 5-ring, as it ends on the right margin.
The results
This rifle is deadly accurate with Crosman Premiers and not very good with BBs. I wouldn’t even bother with BBs in the 2100 anymore because I have a host of BB pistols that will out-shoot it. But with Premier lives, it’s a different story.
The 2100B has earned the right to a special 25-yard test with a scope sight. That will come in Part 4, and I charge blog reader J with making sure I don’t forget to do it!
Crosman 2100B multi-pump air rifle: Part 2
by B.B. Pelletier

Crosman’s 2100B is a full-sized, multi-pump that hopefully delivers power and accuracy with a few economic concessions.
Today, we’ll look at the velocity of the Crosman 2100B multi-pump, and a strange thing occurred during the test. Actually it was two strange things — one an amazing coincidence and the other just weird. Both relate to oiling the gun, and both will be informative.
First, the coincidence. As I was writing this blog (last week, because I’m in Las Vegas at the SHOT Show this week), I got a question from a reader whose 2100 wasn’t pumping air. I asked him if he had oiled the pump piston head like he was supposed to, and I directed him to the online owner’s manual that tells how to do it and to a blog I wrote years ago that tells the same thing. A couple hours later, I get a thank you message that he’s oiled the gun and it seems to be holding air.
So, there I am in my office pumping the gun and shooting it for velocity and I ask myself about the state of the pump piston head of the particular gun I’m testing. Sure, it’s brand-new, but that doesn’t mean that it has enough oil. I look, and the pump head appears to be dry. For those who wonder what I’m talking about, please read the manual.
Then, I recalled that someone had guessed that this rifle would shoot in the low 600s with lead pellets, because someone he knew had tested it. Lo and behold, it was shooting only about 622 f.p.s. on 10 pumps (which is the maximum) with Crosman Premier 7.9-grain pellets. Wow! He was right!
But, wait! The pump head was dry, so I oiled it with some Gamo oil for CO2 guns. The velocity jumped to 658 f.p.s. with the same pellets and 10 pumps. But after about 10 shots the velocity started declining again.
So, I oiled the pump head again — this time with Crosman Pellgunoil. The velocity jumped to 690 f.p.s. before sliding backward to the 620s.
What did I learn?
First, I re-learned for the umpteenth time how important it is to oil a multi-pump gun. That was all it took to fix the reader’s rifle! Second, I saw that the test 2100 rifle responds to oiling immediately, but falls off again almost as fast.
So, the published velocity of 725 f.p.s. can probably be achieved with real-world lead pellets for a brief time, but this test gun won’t hold that velocity very long. Maybe the material the pump head is made of needs a break-in period? I don’t know. What I do know is that I can change the velocity of this gun by 70 f.p.s. simply by oiling it.
It doesn’t end there, however. While that story was unfolding I was also experimenting with the speed of my pump strokes. Since the pump head seemed somewhat hard, I figured that faster pump strokes would build more pressure. And they did! I could increase the velocity by 10 f.p.s. at least, just by changing the speed at which I pumped. I’ve tried the same thing in the past with other multi-pumps, but this one is particularly sensitive.
I think the most representative method of testing this rifle for velocity is to let it sink back to its lowest velocity and stabilize there. That way, the velocity test will also represent the velocity at which the accuracy test is conducted, because I’m certainly not going to oil the pump head after each and every group! Undoubtedly, there’s sufficient oil in the gun right now because of the two oilings I mentioned.
Crosman Premiers
The first pellet tested was the 7.9-grain Crosman Premier. Since the 2100 is a multi-pump, I decided to test each pellet and BB at 5 pumps and 10. That gives us a good picture of what the gun can do across the entire range.
On 5 pumps, Premier lites averaged 540 f.p.s. when the gun was pumped fast. They ranged from 537 to 543; and at that velocity, they produced 5.12 foot-pounds On 10 pumps, again with rapid pump strokes, this pellet averaged 630 f.p.s. The range went from 628 to 635 f.p.s., and the average muzzle velocity was 6.96 foot-pounds.
JSB Exact 8.4-grain dome
Next I tried the 8.4-grain JSB Exact dome. On 5 fast pumps they averaged 526 f.p.s., with a spread from 517 to 531 f.p.s. The muzzle energy averaged 5.16 foot-pounds. On 10 pumps, they averaged 608 f.p.s. with a spread from 595 to 611 f.p.s. The average muzzle energy was 6.9 foot-pounds.
JSB Exact RS
For a light pellet, I tested the JSB Exact RS. The name of this pellet includes the word Match, but they’re domes, not wadcutters, and cannot be used in formal match shooting. At 7.33 grains, they’re very light, yet I’ve had some good luck with them in other pellet rifles.
In the 2100, 5 pumps gave an average 559 f.p.s. The spread went from 555 to 563 f.p.s. The average energy was 5.09 foot-pounds. On 10 pumps, the average velocity was 646 f.p.s., and the range went from 635 to 654 f.p.s. At the average velocity, the muzzle energy was 6.79 foot-pounds.
So, the reader who said the 2100 wouldn’t get to 700 f.p.s. was right. As long as you don’t shoot it immediately after oiling with Pellgnoil, it won’t shoot that fast. But oil it, and it’ll probably top 700 f.p.s. with lighter pellets.
On to BBs
BBs were next, and with them things are much more standard. Though there are subtle differences in BB brands, they don’t vary as much as pellets. We’ll now see if the advertised velocity of 755 f.p.s is reasonable. Since this is a Crosman gun, I tested it with Crosman Copperhead BBs.
BBs are loaded into the large reservoir, then the gun is shaken and they fall into the smaller spring-loaded magazine. Once the magazine is empty, you can shoot pellets again, even though there BBs are still in the big reservoir; if they aren’t in the magazine, they won’t load automatically.
On 5 pumps, Copperheads averaged 570 f.p.s. They ranged from 564 to 578 f.p.s. At the average velocity, they generated 3.68 foot-pounds of energy at the muzzle. On 10 pumps, they averaged 678 f.p.s. and ranged from 672 to 682 f.p.s. That’s an average muzzle energy of 5.21 foot-pounds.
So the bottom line is that the test gun doesn’t meet its advertised spec for velocity. It falls at least 73 f.p.s. short. It does the same with lead pellets, so I’m withdrawing my remark that the gun is suitable for light hunting. Clearly, it’s below the safe margin. Yes, it will kill small animals, but I could not recommend it for that task based on these results.
I also note that the barrel is starting to loosen at the breech. It rotates slightly at this point, and I’ll keep an eye on it. And the pump lever hits the gun with a loud slap on every pump stroke — there’s no cushioning material to deaden the sound.
I hope these results don’t disturb owners of this gun, because they in no way condemn it. The accuracy test is still to come, and we might get a big surprise there.





