Posts Tagged ‘Air Venturi Pellet Pen and PellSet’
by Tom Gaylord, a.k.a. B.B. Pelletier
Walther LGV Olympia was a top-quality 10 meter target rifle from the 1970s.
Don’t get confused. The title of this blog is the Walther LGV Olympia field test, but the first part was titled, We interrupt our regular program….I used that title so I wouldn’t give away the topic that first day. This report is, indeed, about the Walther LGV Olympia of history, but this is a new take on it. I already reported on it two and a half years ago, but that report was about the rifle as a vintage 10-meter target rifle, which at that time was all the LGV had ever been. Only in 2012, when Walther brought out their new line of sporting rifles under the LGV model name, was the LGV anything except a breakbarrel target rifle.
We’ve now looked at the .177-caliber Walther LGV Master Ultra rifle and also at the .22-caliber LGV Challenger (which I now own), so I thought it might be nice to see how the original LGV stacks up to these new rifles. This test will look at the vintage LGV Olympia at 25 yards and at 50 yards. At both distances, I’ll use the rifle’s target sights. I mentioned last time that when I tested the FWB 300S at 50 yards, it didn’t seem to matter that much whether target sights or a scope was used, so I see no need to switch the sights on this rifle.
One thing I have learned in the two and a half years since testing the LGV target rifle is how deep-seating the pellet often has a dramatic affect on accuracy. We have seen that with other airguns, but this will be the first time I think I’ve tested it on a vintage target rifle. This should be an interesting test. And, because the LGV is a breakbarrel, it plays right into the test plan, because breakbarrels are the easiest type of guns in which to seat the pellets deep.
Naturally, I’ll use the Air Venturi Pellet Pen and PellSet seater to seat the pellets. It’s so easy; because once you set the optimum seating depth, it never changes until you change it. If you don’t have a tool, you can seat pellets with a ballpoint pen…but the seating depth is not adjustable.
Today, we’re just going to see how well the rifle performs with some sample pellets that might get chosen for the 25-yard test. I’ll test the velocity of all pellets both seated flush with the end of the barrel and also seated deep. That will be a good comparison.
JSB Exact Heavy
You must wonder if I’ve lost my mind, testing the 10.34-grain JSB Exact Heavy domed pellet in a rifle this weak. No, that’s one of the types of pellets I expect might do well at 50 yards. It certainly has the capability to buck the wind, so I thought it might be a good one to test. I have almost no experience shooting airguns of this low power level out to 50 yards, so this is just a hunch.
JSB Exact Heavys averaged 500 f.p.s when seated flush with the breech. The low was 499 f.p.s., and the high was 501 f.p.s., so there was a total variation of just 2 f.p.s. That’s remarkable for a spring-piston air rifle — I don’t care what type it is! This pellet generates 5.74 foot-pounds of muzzle energy.
When seated deep, the same pellet averaged 511 f.p.s., with a low of 509 f.p.s. and a high of 512 f.p.s. The spread opened up to 3 f.p.s., which is still astonishing. Deep-seated pellets averaged 11 f.p.s. faster than flush-seated pellets. The average muzzle energy was 6.0 foot-pounds.
The second pellet I tested was the ever-popular RWS Superdome. This is another pellet that I believe might do well at long range when fired from this air rifle. When seated flush, they averaged 552 f.p.s., with a 17 f.p.s. velocity spread from 543 f.p.s. to 560 f.p.s. The average muzzle energy this pellet generated when seated flush was 5.62 foot-pounds.
When seated deep, the average velocity increased by 10 f.p.s. to 562 f.p.s. The spread ranged from 557 to 565 f.p.s., so it tightened up to just 8 f.p.s. The average muzzle energy was 5.82 foot-pounds.
Next, I tested the Beeman Kodiak pellet. This is another heavy pellet that I plan to try at 25 yards; and if it does well there, at 50 yards, too. At 10.65 grains, this is the heaviest pellet in today’s test. When they were seated flush, Kodiaks averaged 483 f.p.s. in the LGV Olympia. The spread went from a low of 478 f.p.s. to a high of 487 f.p.s., so 9 f.p.s. in total. That’s still pretty tight. The average energy was 5.52 foot-pounds.
When seated deep, the average velocity for Kodiaks increased to 501 f.p.s. The spread now went from a low of 479 f.p.s. to a high of 515 f.p.s., so a total of 36 f.p.s., which is on the high side. The average muzzle energy was 5.94 foot-pounds.
JSB Exact Express
The JSB Exact Express pellet is one I haven’t tried before. It’s a dome that weighs 7.87 grains. Normally, I would try the JSB Exact RS pellet in a rifle like this; but when I tested it in the past as a 10-meter rifle, I did try the RS pellets and they didn’t seem to do very well at 10 meters. So, I welcomed the opportunity to include this new JSB dome in the test.
Although it’s heavier than the RS, this Express pellet is still the lightest pellet I tried in this test. When seated flush, it averaged 585 f.p.s., with a spread from 569 to a high of 593 f.p.s. The average muzzle energy was 5.98 foot-pounds.
Of course, I expected this pellet to go even faster when seated deep, but it didn’t. In fact the relationship between deep-seating and velocity turned around 180 degrees with this pellet. The average for deep-seated Express pellets was 547 f.p.s., with a range that went from 545 to 553 f.p.s. The average muzzle energy was 5.23 foot-pounds. So, just like we have seen in some tests of deep-seated pellets in the past, here’s another surprise. I wonder what will happen in the accuracy test?
The Walther LGV Olympia has an adjustable 2-stage match trigger. The one on my rifle is set very nicely, and stage 2 breaks at 10.5 to 11 oz. I can do very fine work with a good trigger like this.
Impressions thus far
I was surprised by how consistent the rifle is with JSB pellets. The fact that 3 pellets increased when seated deep, while one decreased, is also something curious. It just points out the need to test a gun in as many ways as you can think of, I guess.
Best of all, this test gives me one more opportunity to shoot and handle this rifle. I own many nice airguns, but my work doesn’t often afford the chance to play with them; so, tests like this one are a refreshing change for me. And I know that many of you get enjoyment from reading about a fine vintage airgun. It’s a nice change of pace.
I do hope the newer readers will see how nice these older airguns are and maybe use the links to explore them more thoroughly. If you’re new to the shooting sports, this is where a lot of the fun is found.
by Tom Gaylord, a.k.a. B.B. Pelletier
Before I begin today’s report, I have sad news. Our friend Earl “Mac” McDonald passed away on Sunday, May 5, at 4:30 a.m. He was surrounded by his family.
Mac was diagnosed with a prion disease in April of this year. I don’t want to discuss it here, but if you want to know more, here is a link. This disease affects one person in a million. It is not only very rare, but the cause wasn’t even discovered until the 1980s. Scientists are still unsure of all the details.
I was aware of the probable diagnosis when I went to visit Mac last month but was asked not to disclose the details. Fortunately, when I arrived, he was able to recognize me. I sat with him and talked about old times whenever he was awake. My wife, Edith, and our friend Otho Skyped with Mac. Via the computer, Edith showed Mac the SHOT Show report in Shotgun News, which was the last thing he photographed for me.
Like everyone who knew him, I’m saddened by his passing — but that is more than offset by the pleasure of knowing him as long as I did. The fact that he was able to attend this year’s SHOT Show was especially rewarding.
As this blog moves forward, I will occasionally refer to Mac and some of the things he did. The best memorial I can give him is to never forget the time he was here.
I left you with a cliffhanger last Friday — more than I imagined, as it turned out, because I thought I was writing Thursday’s report and would publish the second part on Friday, rather than today. I know you all want to know what happened when I seated the H&N Finale Match Pistol pellets deep in the bore with the cocking aid attached and rested the pistol directly on the sandbag.
If you were expecting a Cinderella story, it didn’t quite happen. The group got measurably better — in fact, it was the second-best group of the test to this point. Ten shots made a group measuring 1.105 inches between centers. Compared to the previous group, which was larger than 2 inches, it seemed clear that this was the best way to shoot this pellet — deep-seated, gun rested on the bag and the cocking adapter attached.
Ten shots with H&N Finale Match Pistol pellets seated deep with the cocking aid attached and the gun rested directly on the bag made this 1.105-inch group. So, deep-seating these pellets reduced the group size by half.
Did you possibly think that it put all 10 into the same dime-sized hole that the 5 good ones went into on the previous test? I hoped that would happen, too, but it didn’t.
Not H.P.White Labs
Before you start looking back at all the testing done on this pistol to-date to recommend different things for me to test, let me say I am not H.P. White Laboratory, and the goal of this test is not to see how accurate the Benjamin Trail NP pistol can possibly be. My purpose is to evaluate the pistol as it comes from the box, so those thinking of making a purchase will have something to go on. I think I’ve done that already, and the gun is definitely worth the money. But the test is far from finished.
Air Venturi Pellet Seater
Blog reader Nomobux asked me how deep I seated the pellets with the Air Venturi Pellet Pen and Pellet Seater. Well, that varies, based on how thin the pellet skirts are. But I measured the seater with the pin protruding by 0.163 inches, which seated the pellets about 0.125 inches deep.
A blog reader asked me to test Crosman Destroyers — a new hollowpoint that has a large open cavity in the nose. Since I was playing, I decided to shoot 5 shots and see if it was worth finishing the group. With the pellets seated deep, the cocking aid attached and the gun rested directly on the bag, 5 shots made a group measuring 2.546 inches, so I stopped there. Since that was already very large and 5 more shots would not make it any smaller I decided to save my time and effort.
Five shots with Crosman Destroyer pellets seated deep with the cocking aid attached and the gun rested directly on the bag made this 2.546-inch group. I stopped after 5 shots because the group was already too large.
But I also figured some of you wouldn’t let me rest if I didn’t test at least one more variable with this pellet, so I shot it seated flush, as well. Surprise! It turned out better. Ten shots went into 2.086 inches. That’s not a world-beater group, I know, but it is better than the 5 shots with deep-seated pellets. It points out that deep seating has to be evaluated on a case-by-case basis.
Ten shots with Crosman Destroyer pellets seated flush with the cocking aid attached and the gun rested directly on the bag made this 2.086-inch group. Though it’s not a great group, it is better than the 5-shot group with deep-seated pellets.
Michael, Michael, Michael!
Blog reader Michael saw that I hadn’t yet tested the best-shooting RWS Hobby pellets from the rested position with the cocking aid attached, but he was standing on my shoulder as I played with the pistol. I knew you would want me to go back and test it this way, so I did. This time, the magic didn’t work, however, and the 10-shot group size was 1.536 inches, so no improvement.
Isn’t it interesting how changing one variable will change the entire performance of the gun? I think so.
The bottom line is that the Benjamin Trail NP is still a whole lot of value for the price tag. And I’m not finished, yet. There’s still another accuracy test to go with those lead-free pellets; and then I want to recheck the velocity of the gun, now that several hundred shots have been fired. There’s more to come, so sit back and enjoy.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today we’ll make blog history. This is the first half of a 2-part report on the Benjamin Trail NP pistol. I was shooting it yesterday and found myself going in so many directions that I collected too much data for a single report. So the second half of today’s report will come on Monday.
I told you in the last report that I decided to “play” with the pistol rather than subject it to a rigidly structured test. Well, that must be catching because I did it again today. Something about this air pistol seems to invite experimentation.
It doesn’t have to shoot low!
I said that it shot too low in the last report. It did, but I was using the sights in a way the manufacturer did not intend by using the tip of the front sight for a 6 o’clock hold. That caused the gun to shoot a little low by itself. But, today, I replaced the rear sight with a red dot sight and found that the gun can shoot to the point of aim with ease. In fact, I had to adjust the sights down, but I will talk about that later.
I mounted a Tasco Pro Point dot sight on the 11mm dovetails that are on the rear of the spring tube. You could use anything that has a decent amount of adjustability.
It’s so much easier using a dot sight because there’s just the dot and target to watch, instead of the sight alignment. Shooting the pistol was much easier.
The first pellet: RWS Hobby
In the last test, RWS Hobby pellets were the most accurate, so those were the first pellets I tested this time. That made it simpler to test the gun because I knew I was starting with a reasonably accurate pellet.
And because this will become important in a while, let me tell you that these first groups were shot without the cocking aid on the gun. It’s a little harder to cock without the aid, but installing and removing it for every shot takes too much time.
The first group surprised me, because it wasn’t as good as it was the last time I tested this pistol. The first shot was a low flier caused by my unfamiliarity with the dot sight; but after that, all the rest of the shots were the best I could do. I think the measurement for 9 shots is more representative in this case, and let’s exclude that one low shot.
Nine shots went into a group that measures 2.04 inches between centers. That’s still larger than the group I got with open sights, which is 10 in 1.155 inches. I wondered if some of the stock screws might have loosened in all the shooting. I checked, and they certainly had. I tightened all stock screws; but instead of running the same test again, I proceeded to the next test. How would the pistol respond to pellets seated deeply with the Air Venturi Pellet Pen and Pellet Seater?
Not only did the group improve measurably, the point of impact rose by two inches when I seated the pellets deep into the breech with the pellet seater. This pellet seater is really proving to be a valuable piece of equipment when used on certain guns — like this one. And this rise in the point of impact is why I say there’s no problem with the Trail NP shooting low. You simply need to seat the pellets deeply.
This time, 10 RWS Hobbys went into 1.025 inches between centers. That’s remarkably close to what I did last time with open sights, but just a trifle better.
Since deep-seating seemed to produce such good results, I decided to seat all pellets from this point, on. For my next test, blog reader Victor suggested that I try some good competition pellets. He recommended some H&N pellets, so I selected H&N Finale Match Pistol pellets. I seated them deep and proceeded with the test. But, oh, my, they didn’t do well at all! At least not when taken as a whole.
Five of those pellets managed to make a very tight little group. They gave me hope that this pellet wasn’t as bad as the numbers said. Perhaps something more was required?
The dot showed that I was shaking a lot more than I was comfortable with, despite using a two-hand rested hold. My forearms were resting on a sandbag, and the pistol was held in my hands, just in front of the bag. It sounds like a solid rest, but the dot said otherwise.
Since I was playing with the gun anyway, I stopped shooting for score and started experimenting with different holds that were firmer. I tried using my off hand as a modified artillery hold, but that was just as shaky. Then, I laid the gun directly on the sandbag and had a go. That proved to be the best way to hold it, as all shaking stopped and the pellets landed together again.
I also thought that if I was going to rest the gun on the bag, I might as well use the cocking aid again, too. I had now fired the gun about 50 times in all and wanted to relieve some of the strain on my hands. So the cocking aid went back on the gun.
And that’s all I’m going to tell you today. Tune in Monday to see if this new position paid off.
by Tom Gaylord, a.k.a. B.B. Pelletier
Remember that I said I would return and do another accuracy test of the Beeman HW 70A pistol because I didn’t test the best pellet seated? I felt a little guilty about missing that; but after my wife, Edith, got done with me, I felt really guilty. Good job, Edith!
Today is a revisit to see the effects of deep-seating the best pellet, which you may recall was the Beeman H&N Match. The other two pellets I shot last time aren’t in the running, so they don’t get retested.
However, a reader commented that his HW 70A really likes the JSB Exact RS dome, so that one got tested, too.
Several readers described their pistols as very accurate. One person even said his was a tackdriver. That really drives me nuts because of the results I’m getting. And I’m a good pistol shot — plus, I’m shooting the gun rested! I ought to be there with the best of you, but up to this point I’m not.
Beeman H&N Match
This was the best pellet in the first accuracy test, so this is the one I started with. And I started with the deep-seated pellets. I’m using the Air Venturi Pellet Pen and Seater, and the adjustment hasn’t changed since the last time, so everything is equal.
The first group was pretty poor. I thought I’d forgotten how to shoot because it looked nothing like the group of flush-seated pellets from the last time.
That prompted me to try a group of the same pellets seated flush. You will remember in Part 3 that, when these were seated flush, 10 of them made a 1.085-inch group. This time 10 flush pellets went into 1.067 inches. That’s pretty close to the last time, and very persuasive that flush-seating is what this pellet likes!
JSB Exact RS
Next I tried some JSB Exact RS domes — just to see if I could duplicate what a blog reader reported. Lo and behold, I did! As I was shooting, I could see that the group didn’t seems to be growing, and I had a sense that the pistol was drilling the target. As you can see, it was doing exactly that! Ten pellets in 0.761 inches at 10 meters. I wouldn’t call it a tackdriver, but it’s the next best thing.
Next, I was going to try the same pellet seated deep, but that’s when I saw that the barrel was flopping from side to side at the breech! Oh, no! All that work for nothing!
Fortunately, this pistol has a pivot bolt that can be both tightened and also locked in position with a jam screw. However, I didn’t have time to do that because I was crashing on tests to put in the bank for my trip to see my friend Mac.
When I return from my trip, I’ll tighten the breech and rerun this entire test — plus shoot the RS pellet deep-seated. So, there’s fifth part coming.
by Tom Gaylord, a.k.a. B.B. Pelletier
Today you get a twofer. Or at least it will be more than just one test, as I’m starting to test a second product with today’s accuracy test of the Beeman HW 70A pellet pistol. The other product I’m testing is the EyePal Master Kit for Rifles and Pistols. Because it did play a pivotal part in today’s test, let’s begin with it.
EyePal Master Kit for Rifles and Pistols
The EyePal is a soft patch that’s applied to prescription or safety glasses to provide an aperture for the sighting eye. This concept is close to a century old, and many of the veteran readers will remember the Merit adjustable iris that had a suction cup to attach to glasses. The Merit was adjustable, so the aperture you looked through was controlled by the user. The EyePal is not adjustable. In the Master Kit I’m evaluating, there’s one soft patch for handguns and another for rifles. They have different sized holes, and the handgun patch that I used in today’s test has the slightly larger hole. The lids on the boxes and the patches themselves are color-coded so you know what each one is.
I won’t report on the EyePal as a separate item because I need to use it more than a few times to get comfortable with how it works. So, very much as I reported on the Winchester Airgun Target Cube over several tests that spanned many months, I will do the same with the EyePal.
I’ve tried the Merit accessory in the past and found it to be quite difficult to position. Also, as it aged, the rubber suction cup that held it to the glasses hardened and became less pliable — to the point that it eventually stopped working.
The EyePal patch, in sharp contrast, attaches easily and can be removed just as easily, though it does have to be pried up at one corner before it comes off. I find that it’s very intuitive to use the first time and that repositioning it is simple and needs no explanation.
Shooting the HW70A
Now, it’s time for the test. I found myself faced with a number of test variables, so I decided to test all of them with the first pellet, and then use the best result from those tests for the other pellets. The first pellet was the RWS Hobby. The test was a rested pistol held in two hand at 10 meters. I used standard 10-meter air pistol targets.
When I say I shot the pistol rested, I mean that both my arms rested on a sandbag. The pistol was held forward of the bag, so it never touched them to set up a variable recoil reaction. I kept both hands in the same place on the pistol for each shot.
I had to test this pistol under the following circumstances:
* Pellet seated deep and EyePal worn
* Pellet seated flush and EyePal worn
* Pellet seated flush and prescription glasses worn with no EyePal
* Pellet seated flush and no prescription glasses worn with no EyePal
The 4 targets for the first part of the test are shown below. I used RWS Hobby pellets every time for these 4 targets. After you look at the results, I’ll critique them and tell you what I found.
Hobbys were seated flush and EyePal was worn on prescription glasses. Group measures 1.863 inches between centers. The large central group within this group made me think this was the best group of Hobbys.
First, I have to tell you the EyePal did make the front sight appear sharp when glasses alone did not. However, without glasses, the front sight appeared just as sharp as with the EyePal. What I did not know until I measured all the groups for this report was that deep-seated pellets measurably outshot all flush-seated pellets. That was a surprise; and if the Hobby pellet was the only one I used, I would re-run this test. But as you’ll soon see, I don’t have to.
The next thing I discovered is that the Hobby pellet wasn’t a good fit for this gun. These groups do not show what the HW 70A can do. However, this does illustrate an important point. By staying with the same pellet and varying other things, it didn’t really matter that the pellet wasn’t the best. I was still able to compare the effects of the other variables by staying with the same pellet.
Next, I must say that the trigger that I liked in Part 2 isn’t as crisp as I would like it to be. It has a very mushy, indistinct pull and release comes as a surprise every time. While that sounds good, it actually isn’t because the trigger can go off before you’re ready.
The bottom line for the first test is that deep-seated pellets and the EyePal on prescription glasses produced the best results. However, I did not pick up on that during the test, and shot all the other groups with the EyePal and flush-seated pellets.
Test 2: 3 other pellets
Next, I shot the pistol with Crosman Premier 7.9-grain pellets. The group measured 2.163 inches between centers and was clearly not in the running for this pistol.
Premier lites were seated flush and EyePal was worn on prescription glasses. Group measures 2.163 inches between centers. It looks like only 9 pellets were fired, but they were counted carefully and there were 10. Not a pellet for this air pistol.
Then, I tried 10 Beeman H&N Match pellets. Bingo! This was the pellet I was looking for. Ten made a 1.085-inch group that’s very round and unifirm.
Because the H&N Match pellets did so well, I also tried RWS R10 Match Pistol pellets. For them, I adjusted the sights back to the center of the bull. They didn’t do as well as I’d hoped, grouping in 1.18 inches. While that’s the second-best group of the test, the H&Ns are clearly better this time.
For those who keep score, I shot this pistol 70 times in this test. I was concerned about getting tired, but the best two groups were the last two. So, I think I gave it a fair evaluation. However, I do admit that the best method of loading is deep-seating pellets, and I didn’t use that on the most accurate pellets. I’m going to come back and do a part 4. It’ll be at 10 meters, again, and only Beeman H&N Match pellets from this test will be used along with several new target pellets.
by Tom Gaylord, a.k.a. B.B. Pelletier
Okay, there’s some interest in this Beeman HW 70A, but many of you have avoided it like I have. Let’s see what it can do.
First, the cocking effort. HW advertises 21 lbs., however the test pistol registered 27 lbs. on my bathroom scale. While that may not sound like a lot, remember this is a close-coupled pistol, so there’s no long lever like you have on a breakbarrel rifle. So, 27 lbs. does feel like a lot.
The trigger-pull, on the other hand, is very light. The test pistol releases at just 2 lbs., 3 ozs. And that’s after I adjusted it to be heavier. I’d gotten it so low that it surprised me when it went off. That felt too dangerous; but where it is now feels pretty good.
Premier 7.9-grain domes
The first pellet to be tested was the Crosman Premier 7.9-grain pellet. It averaged 371 f.p.s., and the spread went from a low of 364 to a high of 381 f.p.s. At the average velocity, this pellet generates an average 2.43 foot-pounds of energy at the muzzle.
Next up was the 7-grain RWS Hobby. As light as they are, I expected Hobbys to be the speed demons of the bunch, but they weren’t. Hobbys averaged just 363 f.p.s., with a spread that went from 354 to 372 f.p.s. At their average velocity, Hobbys produced 2.05 foot-pounds of energy at the muzzle.
Beeman H&N Match
The last pellet I tested was the Beeman H&N Match pellet. This wadcutter weighs 8.18 grains and was the heaviest pellet I tested. The average nuzzle velocity was 383 f.p.s. — making this not only the heaviest but also the fastest of the 3 pellets tested. The range went from 371 to 395 f.p.s. At the average velocity, they generated 2.67 foot-pounds of energy at the muzzle.
I was puzzled
After testing these 3 pellets, I was puzzled about the velocity claims of 440 f.p.s. by the manufacturer. I thought that Hobbys would at least get close to that number, but as you can see, they were the slowest pellets of all, not to mention being the lightest. That made me wonder why they would be so slow. It seemed that they were also the pellet with the largest skirt, so maybe the gun was having difficulty overcoming the pellet in the breech. That’s when I thought about deep-seating each pellet with the Air Venturi Pellet Pen and Seater to see how it would change — if at all.
Deep-seated Hobbys now averaged 419 f.p.s. and the spread that had been 18 f.p.s. before was now down to just 9 f.p.s. The muzzle energy went up from 2.05 foot-pounds to 2.73 foot-pounds.
H&N Match also increased, but the difference was much less. After deep seating, they averaged 392 f.p.s. and generated 2.79 foot-pounds at the muzzle. The total spread dropped from 24 f.p.s. to just 7 f.p.s.
Even Premier lites increased from 371 to 380 f.p.s., bumping the muzzle energy to 2.53 foot-pounds. And the total spread dropped from 17 f.p.s. to just 8 f.p.s.
Deep-seating seems to help calm this gun down and also to boost velocities. I guess I’ll have to try it when I test the pistol for accuracy, as well.
Impression thus far
Though the velocity seems to be a little low, the firing behavior is smooth and positive. The pistol feels right when it fires, and I think it’s going to turn in some surprising accuracy. But we shall see.
by Tom Gaylord, a.k.a. B.B. Pelletier
This Diana 25 smoothbore was made in World War II.
Today’s blog falls under the heading, “It’s not always a good idea to try everything.” Back when we were exploring the Diana 25 smoothbore airgun, we saw how incredibly accurate it was with certain pellets at 10 meters.
This 10-shot group of JSB Exact RS pellets was shot at 10 meters. The extreme spread measures just 0.337 inches between centers! It made us all wonder just how accurate a smoothbore pellet gun can be.
When I backed up to 25 yards, however, the groups opened up to between 2.5 and 3+ inches for the same pellet. Obviously, the pellet needs to be stabilized by both the high drag of its diabolo shape and by the spin introduced by rifling. Drag, alone, is not enough to stabilize the pellet.
One reader then asked me to try shooting round lead balls in the gun. Today, I’ll conduct that test for you.
Beeman Perfect Rounds
I shot Beeman Perfect Rounds, which are H&N Rundkugel but under the Beeman label. They weigh 7.7 grains, which is the weight of a medium-weight diabolo pellet.
The balls fit the Diana’s breech quite well, though one was slightly larger than the others. But the rest would not drop into the breech and had to be seated with the thumb — just as a pellet would. They did seat easily, however, and I noticed the gun’s powerplant seemed harsher than it is with pellets. I suspect the balls had less resistance than a pellet since they only touched the bore at their circumference, and there’s no rifling to engrave them.
Except for one, each round ball fit the gun’s breech very well. Most stopped like this and had to be gently pressed into the bore with the thumb.
Testing at 10 meters
I began the test at 10 meters, thinking the gun was accurate at that distance with diabolos, so it should be accurate with round balls. I’m sure the reader who asked me to test round balls must have thought the same thing. But when I fired the first shot and could not find the hole on the target paper, I stopped shooting. Fortunately there were no new holes in the wall!
I then moved up to 12 feet and shot again — this time standing and using the door jamb as a brace. The shots now went to the bull at which I was aiming. But the group is hardly worth celebrating. Ten shots went into 1.166 inches at this distance. I’ve shot many BB guns that could do so much better than this that it’s embarrassing to consider.
Ten shots from 12 feet did make a group on the target, but that’s way too close for a gun like this! Group measures 1.166 inches between centers.
I guess the Diana 25 isn’t made to shoot round balls. If there was any doubt before, I hope this clears it up. I didn’t shoot any more groups because of how harsh the powerplant seemed to be. I didn’t see any reason to strees the mechanism more than I already had.
Shooting round balls got me thinking about other types of non-pellet projectiles, and of course darts came to mind. I decided not to try them in this gun,as the powerplant is too powerful for them. It would bury a dart deep in wood, causing its destruction upon extraction. But that did give me another idea.
I was recently asked to conduct a retest of a gun I tested some time ago. Apparently, a blog reader felt my results were not typical of the gun I tested, so he called the manufacturer and they contacted me. That gun in question is a smoothbore, as well, and it’s a multi-pump, so the velocity can be controlled. I plan on testing darts when I test that gun for you.