Posts Tagged ‘Eun Jin pellets’
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• Inconsistent shots?
• Most accurate pellet?
• 100 yards means scope adjustments
• JSB Exact Jumbo heavy pellets
• Crosman Premier pellets
• H&N Baracuda Green pellets
• Gamo Hunter pellets
• Call it a day
• Pyramyd Air sale
Today is a test of the Hatsan AT44-10 Long QE at 100 yards. I don’t do this very often for many reasons; but when I find a PCP that’s exceptionally accurate at 50 yards, I feel it’s worth testing at the greater distance. It takes a perfect day for this test because any wind will push the pellet around. We don’t get many windless days here in Texas, but this past Wednesday was one of them. It was so calm that dandelion fuzz would fall straight down.
You also know from reading this blog that groups do not always open in linear fashion as the distance increases. A rifle that shoots a half-inch group at 50 yards will not automatically shoot one-inch groups at 100 yards — even though the day is perfect.
While testing this rifle, I’d seen that the first 10 shots could be less accurate than the second 10. They sometimes contained fliers that didn’t seem to exist in the second group. Yesterday, blog reader Jerry in Texas asked me why one shot out of 10 from his Benjamin Marauder was dropping in velocity by over 250 f.p.s. I told him I thought some PCP guns do that in certain places in the power curve. I saw evidence of that on the 50-yard range and again at 100 yards, as I’ll show you.
Most accurate pellet?
I also hedged my bets by taking several pellets to the range that hadn’t been tested in this rifle before. I was getting such great performance at 50 yards from one pellet in particular — the 18.1-grain JSB Exact Jumbo Heavy — that I sort of stopped testing other pellets. That’s not very scientific of me, though it’s very much in keeping with being a gun crank. So, I took some other pellets along and gave them a try at 100 yards — even though they’d not been tried by me before in this rifle.
100 yards means scope adjustments
I knew the pellet would drop a lot going from 50 yards to where the rifle was sighted to 100 yards. I guesstimated the drop would be at least 12 inches, which would be 48 clicks on the quarter-minute elevation knob to bring things back up. But when I adjusted the scope, I stopped at 40 clicks because you never know if the clicks are exactly quarter-minute or if that’s just an approximation. As it turned out, both my guesstimate and the adjustments were close to correct, and I had to adjust the scope another 16 clicks up to get close to the point of aim.
JSB Exact Jumbo Heavy pellets
The first pellet up was the 18.1-grain JSB Exact Jubo Heavy that had given me a group of 10 in 0.522 inches at 50 yards. If any pellet was going to excel in this rifle at 100 yards, I felt this one had the best chance. Alas — the best-laid plans….
The best I was able to do with this pellet was 10 in about 3 inches. I shot the same pellet in both the first 10 shots and the second 10 shots per fill with pretty much similar results, except there was a flier in the first group. I’m not going to show you those groups because they don’t help the report and also because the first group fell below the target paper and hit the 2×4 backer paper I always use when I’m not sure where the pellets are going.
At this point, I decided to punt — as in testing something I hadn’t tried before. One reader had recommended trying the 15.89-grain JSB Exact Jumbo pellets, and I thought it was a good choice. It happens to be one of my favorite .22-caliber pellets, and I normally would have tested it at 50 yards; but when the heavier JSB did so well, I decided to just shoot it to the exclusion of all others.
I refilled the rifle with air and loaded 10 JSB Exact Jumbos into the circular clip. The first group was very telling. Nine out of 10 pellets landed in a 1.668-inch group, but the first shot hit about 4 inches above the top of this main group. Remember what I said about inconsistencies in the first 10 shots after a fill?
After that group, I refilled the clip and shot a second group with the same pellet. This time, all 10 went into 2.385 inches. I know that doesn’t sound very good, but I ask you to reserve your comments until you have shot some 10-shot groups of pellets at 100 yards. It isn’t easy! And guns that group in a half-inch at 50 yards do not necessarily group in one inch at 100 yards.
Look at the shapes of these holes. Many are oval in shape, which indicates they didn’t go through the paper straight-on.
Crosman Premier pellets
One of the most accurate .22-caliber pellets is the domed Crosman Premier that comes in the brown cardboard box. Sometimes, they’re the most accurate, and other times they’re among the top 3. But in PCPs they don’t do as well — especially when the PCP is more powerful such as this Hatsan. And this was no exception to that rule, as Premiers couldn’t stay inside 6 inches at 100 yards. I didn’t even complete a group with them after seeing the first few shots land so far apart.
I’d planned on trying Eun Jin pellets, as well; but when I started loading them, I discovered that the tin I picked up were .25-caliber pellets.
H&N Baracuda Green pellets
The next pellet I tested was the H&N Baracuda Green. While lead-free pellets are not that accurate as a general rule, Baracuda Greens are an exception. In the Hatsan, they managed to put 10 shots into 5.25 inches, with 9 of those shots in 2.988 inches. That’s pretty good for lead-free pellets; and, yes, this was the first group of 10 after a fill.
Gamo Hunter pellets
The last pellet I tried was the Gamo Hunter. While I have very little experience with this pellet, I do recall it working well in one spring rifle years ago. But it was not suited to the Hatsan AT44. I didn’t see where the first Hunter struck the target; but I saw the second pellet’s flight through the scope, and it was a wild spiral curve to the right that landed a foot off the target! Clearly this rifle is not suited to shoot Gamo Hunters.
Call it a day
After this last attempt, I decided to call it a day. The shooting had worn me out by this time. I think it’s clear that of the pellets I’ve tested so far, the JSB Exact 15.89-grain Jumbo is the best. Out to 50 yards it may do no better than the heavier 18.1-grain JSB Jumbo Heavy, but something about this lighter pellet carries it to 100 yards in better form.
I believe the Hatsan AT44-10 Long QE is one of the finest PCP rifles on the market at any price. It has power, accuracy, a great trigger and very quiet operation –all for a wonderful price. If you’re in the market for a good PCP, I would put this one on your short list.
Pyramyd Air sale
Pyramyd Air is having a “Christmas in July” sale. If you’re planning to make a purchase, click here to visit their sale pages.
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• Fast becoming a favorite
• Accuracy test
• Stunning first group!
• Tried RWS Superdomes
• Finish with JSB pellets
• Overall evaluation
• 100-yard test
Fast becoming a favorite
Today, we’re back at the 50-yard outdoor range with the Hatsan AT44S-10 Long QE rifle — an air rifle that’s fast becoming a favorite of mine. I think you’ll see why in this report.
Last time, I showed you some excellent 10-shot groups from this rifle at 50 yards. That day was perfectly calm, and by chance the second pellet I tried turned out to be the one to shoot. The 16-grain Air Arms Diabolo Field pellet delivered some great groups, including one 10-shot screamer that was just 0.624 inches between centers. I resolved to return to the range another day to see if this was just a one-time thing or if the rifle could deliver such stunning accuracy all the time.
This day was not perfect. There was a little breeze sometimes, but in the beginning it could be waited out. It was only 1-3 m.p.h. when I began shooting. Last time, I learned that the first 10 shots on a fresh fill weren’t as accurate as the second 10, so I filled the rifle to 200 bar and loaded ten 18.13-grain JSB Exact Jumbo Heavy pellets, thinking that I would save the sure-thing Air Arms pellets for the second 10.
Stunning first group!
But my first group was stunning! Nine of the 10 pellets went into 0.552 inches and only shot 8 strayed from the main group. It enlarged the group to 0.916 inches, which is still commendable for 10 shots.
Now that the first 10 were shot, I thought the rifle was going to give me a wonderful second group with the Air Arms pellets — but for some reason, it didn’t. Ten went into 1.434 inches, with 5 of them clustered in 0.212 inches. How do I make sense out of that?
The Hatsan is short of breath, and there are only 20 good shots per fill if you’re shooting groups at 50 yards. I filled the rifle, again, and once more I shot the first group of 10 with the JSB Exact Jumbo Heavys. This time, they were a little more open than the first time, but they still managed to all be within 0.676 inches. That’s actually smaller than the first group was, and it’s close to the size of the best group from the previous session (0.624 inches).
The second group I shot was 10 Air Arms pellets, and this time they really opened up. Ten went into 1.334 inches, with 8 of them in 0.824 inches. Apparently, Air Arms pellets were not going to do as well on this day as they had during the previous session!
Tried RWS Superdomes
I brought some RWS Superdomes along — just to try one more pellet. But the first shot was 14 inches from the aim point (!!!) and the next shot was 6 inches from that! I ejected the clip and removed all the pellets. That’s just wasting air.
Finish with JSB pellets
I filled the rifle once more and this time decided to just shoot the JSB pellets since they seemed to want to do better. The first group of 10 went into a whopping 1.71 inches, which was surprising. The second group of 10 was 1.351 inches apart, and I was now having to fight a growing breeze. I can’t say how much the wind affected the last 2 groups, but it probably had some impact.
Based on the results of these two days at the range, I have to say the Hatsan AT44-10 Long QE is one of the most accurate precharged pellet rifles I’ve ever shot. It may not be the most accurate, but it has to be in the top 5!
It’s amazing that an air rifle this powerful is also quiet. It sounds about as loud as my vintage Diana model 27 spring rifle, yet I know it’s producing 35-47 foot-pounds of muzzle energy. And the trigger, while not the absolute finest I’ve ever tested, it still right up there in the top 10.
Hatsan has hit the ball out of the park with this rifle! They’re pricing it to compete with the Benjamin Marauder, and it absolutely kills the more expensive European PCPs in all categories except appearance. But I’m the kind of shooter who wants to hit the target. I don’t care that much what my rifle looks like — as long as it can deliver the mail.
The last time I had a PCP that was this accurate was when I tested the AirForce Airguns Condor SS, and that rifle put 10 pellets into one inch (1.003 inches) at 100 yards. This Hatsan isn’t quite as powerful as the Condor SS, but I’m willing to give it a try at that distance. So, there will be a Part 5 to this series!
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• Most accurate test ever conducted!
• Scope and mounts
• Scope base design
• On to the range
• Airgunners…just like golfers!
• What happens next?
You waited for this report. I told you it was going to be a good one. I even advised a couple people to just buy this rifle if they wanted a quiet and powerful PCP that was also accurate. Today, you’re going to see why I said that.
Best test ever conducted!
To cut to the chase, this was the best test of an air rifle I’ve ever conducted at 50 yards. I won’t go so far as to say that the Hatsan AT44S-10 Long QE is the most accurate air rifle I’ve ever fired, because you’ve seen in recent days that I seem somewhat variable. I refer to yesterday’s good test of the Air Arms Shamal after a pervious mediocre test.
However, if I can repeat today’s results at some future date, then I’ll conclude that this rifle is the most accurate air rifle I’ve ever tested at 50 yards. But I’m getting way ahead of myself. Let’s see what happened.
If you’re a regular blog reader, you already know that I was having a good day because the Shamal had just turned in several great groups — including one stunner that measured 0.818 inches for 10 shots at 50 yards. Now, it was the Hatsan’s turn on the bench, and the weather was still perfect.
Scope and mounts
I had mounted an AirForce 4-16X50 scope on the rifle using UTG 2-piece Max Strength high Weaver rings for a 1-inch scope. One of our readers heard that the Hatsan scope base that allows both Weaver and 11mm scope rings to be mounted has problems with Weaver rings, so he asked me specifically to use rings that have a Weaver dovetail on their base. I did, and the UTG mounts fit well, though I will say that the Hatsan base is at the wide end of acceptable width.
But I think I see what the reader has heard about, and I want to share it with you. There are some shooters who feel that all mounts must look attractive and squared away or they don’t fit right. What these people don’t understand is that mount makers use base jaws that will fit as many different configurations of dovetail cuts as possible — because gun manufacturers do not use many standards when making their cuts.
Scope base design
I’m going to explain something here, and I want you to try to understand it because it will make all the difference if you do. Weaver bases are a standard that specifies the width and height of the dovetail, and the width of the cross groove that accepts the locking bar on the mount. But the angle of the cuts that shape the dovetail grooves are not as certain. No doubt, Weaver specifies them, but mount makers don’t always conform to that spec. They use dovetail cutters with varying angles. To deal with this inconsistency, many mount makers, including Leapers, cut the jaws of their ring base clamps with rounded points, so they’ll grip most dovetails, regardless of the angle of the cut.
If there was only one rounded point on the clamp base, the ring would sit cockeyed on the rifle; but when the other end of the same clamp also has a rounded point that engages a special cut in the scope ring and the two cockeyed points cancel each other. The result is a scope ring clamp jaw that looks cockeyed, yet the ring sits squarely on the gun.
In the 1990s, B-Square owner Dan Bechtel and I did a project to determine the standard width of 11mm airgun dovetails. This is where we discovered that those dovetails vary between 9.5mm and almost 14mm in width. The angles of cuts ranged from 45 degrees to 60 degrees. The Weaver base is more standardized, but the cut angles still vary and have to be addressed.
Here you see how the rounded point of the scope ring clamp jaw allows it to fit into a wide variety of rifle dovetail base cuts. Having a rounded point on the other end of the same clamp will cancel this odd angle and allow the scope ring to sit squarely on the rifle.
The genius of this clamp design is lost on many people who see the cockeyed part as a flaw or mistake. Actually, it’s a compensating part that assures an exact fit on a variety of different gun bases. The picture shows this clearly.
For that reason, my answer to the reader who asked whether the Hatsan bases will accept a Weaver ring is — yes. Many ring manufacturers make their ring base jaws this way. If you can tolerate the odd appearance, this solution works perfectly.
On to the range
I was at the range on a perfect day, so this test would be conclusive if a good pellet was found. In the past, you’ve seen me work through a list of pellets, looking for the best one. Well, on this day I happened to find that pellet on the second try. At least, I think that’s the case because that pellet did so well that I didn’t bother trying any others.
I filled the rifle to the manufacturer’s recommended 200 bar (2900 psi) and loaded the 10-shot magazine. The first pellet I shot was the 14.3-grain Crosman Premier dome. I put 10 into 1.463 inches, but I’m not going to bother showing you that group because of what happened next. I knew from the velocity test we did in Part 2 that this rifle probably gets at least 20 good shots per fill when shooting at 50 yards. The velocity does decline with every shot; but as you’ll soon see, that doesn’t seem to matter much.
The second pellet I tried was the 16-grain Air Arms Diabolo Field pellet. It’s a dome that sits comfortably in the middle of the .22-caliber pellet weight range. Although it resembles the 15.9-grain JSB Exact Jumbo and although JSB does produce this pellet for Air Arms, they do so on proprietary dies owned by Air Arms; so, the two pellets are not the same and should not be confused with each other. On other tests, I’ve seen different results from these two pellets.
These 10 pellets were fired on the same fill as the Premiers, so the rifle’s internal pressure was down around 2500 psi when I started shooting. Every pellet went to the same place on the target. It was like they were being guided, or something. The result was 10 shots into a group that measures 0.681 inches between the two centers that are most distant. I was stunned when the group was finished! I’ve probably shot a couple other groups that small with airguns before — certainly with my Talon SS and probably also with a Benjamin Marauder — but this still ranks as one of the best groups I’ve ever shot at 50 yards with an air rifle. And the day was just beginning!
Following that, I refilled the rifle, for 20 shots had now been fired. The pressure had dropped to below 2000 psi, and I think to as low as 1750. I filled it back to 2900 psi and went back to the bench.
The next 10 shots were with the same Air Arms pellets, only this time we started at a full fill instead of only a partial. Ten pellets went into 0.992 inches this time — a little larger, but still in good territory.
Ten more Air Arms 16-grain domes made this 0.992-inch group at 50 yards when the rifle was filled to the maximum. This isn’t a screamer; but coming on the heels of the previous group, it’s pretty good!
Now the rifle was back down to where it had been for the first great group. So, I loaded 10 more Air Arms pellets into the rotary clip and settled down to shoot another group. This time, all 10 went into 0.624 inches. A definite screamer; and with the first group, pretty good proof that the Hatsan AT44-10 Long QE I’m testing is a shooter.
Ten more Air Arms domes made this 0.624-inch group at 50 yards when the rifle was fired on a partial fill. This is the best group of the session and also one of the best 50-yard 10-shot groups I’ve ever shot with an air rifle.
Airgunners…just like golfers!
Like a golfer who shot a sub-par game in which he also got a hole-in-one, I decided that my good luck had probably run its course this day. Besides the 40 shots fired with this rifle, I had also tested the Shamal and shot an additional 40 shots there because there were some adjustments to the scope that had to be made. In all, I’d shot 80 precision shots this day. That’s tiring.
What happens next?
I’ve never had an air rifle that would shoot this many consistently small groups in succession. Either I was having the best shooting day of my life, or this Hatsan rifle can really shoot. I want to return to the range under similar shooting conditions and see if I can repeat this. And I’ll continue to shoot the Air Arms pellets.
I just want to make sure this test was a valid one. It isn’t every day that you shoot the most accurate air rifle you’ve ever seen. I told several readers not to worry but to just buy the rifle if that was what they wanted. Now you see why.
After seeing what can be done with the Air Arms pellet, I want to explore some other pellets in this Hatsan. Hopefully, it’ll do well with several brands so there’s a choice.
After that, who knows? Maybe I’ll try this one at 100 yards. You may remember that I shot a one-inch group of 10 at 100 yards with a CondorSS last year. I wonder if this rifle can do as well?
by Tom Gaylord, a.k.a. B.B. Pelletier
This report covers:
• First pellet
• What to look at
• Next pellet
• Last pellet
• Quattro trigger
• Discharge noise
Remember this report because I’ve done something with this rifle that I don’t normally do. To save some time at the range, since good airgun range days in Texas are often hard to come by, I’ve already tested the Hatsan AT44-10 Long QE at 50 yards. I took it along last week when I was testing the Shamal, and the day was perfect for 50-yard shooting. I’m not going to tell you the results today; but when I do show them, a lot of you will be impressed.
Today is velocity day. Normally, I would have already tested velocity when I went to the range, but this time when I shot for accuracy I had no idea how fast this rifle was shooting. You can’t tell from its muzzle report, either, because the AT44-10 QE is as quiet as a Benjamin Marauder. When I tested it today, Edith thought I was shooting the Benjamin Trail Nitro Piston 2 in my office, instead of a powerful PCP.
The first pellet I tested was the 16-grain Air Arms Diabolo Field pellet, which is a dome. I’ll show you the first 20 shots, then explain what I’m doing. The rifle was first filled to the recommended 2900 psi (200 bar).
The average for this first string of 10 shots was 1000 f.p.s. The high was 1019, and the low was 975 — so the spread was 44 f.p.s. At the average velocity, this pellet generated 35.54 foot-pounds of muzzle energy.
The next 10 shots with the same pellet, and still shooting on the same fill, looked like this.
The average for this string of 10 shots was 946 f.p.s. The high was 970 and the low was 923, so a spread of 47 f.p.s. At the average velocity, the pellet generated 31.8 foot-pounds on this string.
The spread for the entire string of 20 shots was from 923 to 1019 — which is 96 f.p.s. We will look at where the pellets impact on the target with this pellet for both strings in the next report. And, yes, I have focused on this specific pellet.
What to look at
I showed you these 20 shots for a reason. What you see is that the velocity drops from the first shot to the last, with a couple exceptions. Perhaps the maximum fill pressure of 200 bar is understated for the rifle I’m testing, or maybe my gauge doesn’t agree with Hatsan’s gauge for the starting pressure. Some shooters would be tempted to fill to a higher starting pressure to see how the power curve might change; but since I’m at the recommended maximum, I’ll stay where I am.
The air reservoir had 1750 psi remaining after these 20 shots. That’s about the maximum number of shots you can get with this pellet if you’re looking for the best accuracy at 50 yards. If you confine your shots to 35 yards and less, I’m sure there are another 10 shots in the reservoir. The shot count depends on how you’re shooting the airgun. Please keep this velocity relationship in mind as we proceed because I’m not going to record the velocity of the other pellets 20 times. But you know that the velocity will continue to drop with them just as it does with this pellet.
Next up were 28.4-grain Eun Jin domed pellets. We know that these heavy pellets will probably be the most powerful in this rifle because it’s a pneumatic. Pneumatics usually do their best (achieve the most power) with the heaviest pellets.
This is a very long pellet that just fits in the circular clip, but it did fit and functioned fine. I filled the gun to 2900 psi, again, and shot 10 pellets that did the following:
The average for these 10 pellets was 867 f.p.s. The high was 892, and the low was 836 f.p.s. — so the spread was 56 f.p.s. Again, the velocity dropped almost linearly; and at the end of 10 shots, the reservoir was holding 2250 psi. This heavier pellet used more air than the lighter Air Arms pellet that shot 20 shots and ended at 1750 psi. At the average velocity, this pellet generated 47.41 foot-pounds at the muzzle. Remember that number.
The final pellet I tested was the 11.9-grain RWS Hobby. The gun was filled to 2900 psi once more, and another string was fired.
The average for this string was 1107 f.p.s. The high was 1128 f.p.s., and the low was 1078 f.p.s. The velocity spread was 50 f.p.s. As with the first 2 pellets, the velocity fell off linearly. At the average velocity, this pellet produced 32.39 foot-pounds of energy at the muzzle. The reservoir pressure after this string was 2500 psi.
We’ve learned that lighter pellets will use less air than heavier pellets. If you just plink at distances below 35 yards, you can probably extend the number of shots per fill to 30. Hatsan says you should get 30-40 shots per fill, and that’s about what I see from this test. I’m probably going to test it at only 50 yards, although I haven’t yet made up my mind on that.
There doesn’t seem to be a flat spot on the power curve. The velocity just drops from the first shot to the last. We’ll see next time how that affects accuracy.
Velocity and power
Hatsan says you’ll get up to 38 foot-pounds from this rifle in .22 caliber. In fact, I got over 47 foot-pounds, so they’re being very conservative. They also say the top velocity with lead pellets should be 1070 f.p.s., yet I saw over 1100 f.p.s. with RWS Hobbys, which are lead. Again they are conservative. Hatsan has the reputation of advertising realistic velocities and power for their PCPs by using only lead pellets, and this test confirms that.
I adjusted the Quattro trigger and got it to my liking. Stage one now requires 1 lb., 3 oz. and stops at stage 2 most of the time. Stage 2 releases at 3 lbs., 4 oz. There were a couple times when the rifle fired before I could feel the trigger stop at stage 2. I think that may have been partly my inexperience with this trigger, but it made me more cautious. At any rate, the trigger is very adjustable and should please most sportsmen.
The AT44-10 Long QE is an extremely quiet air rifle — especially when you consider the power. Stay away from pellets that go supersonic and you won’t bother too many people when you shoot. It’s quieter than most breakbarrel rifles. You should be able to shoot it without bothering the neighbors, unless they’re listening for you to shoot.
So far, the AT44-10 Long QE is living up to its advertised potential. I just happen know the rest of the story as well; so, although I’ll make you wait a while longer, this is going to be a story you will want to read. If you’re looking for a quiet, powerful, accurate hunting air rifle, watch this test closely.
by Tom Gaylord, a.k.a. B.B. Pelletier
Air Arms Shamal is an attractive PCP. It was Air Arms’ first precharged rifle.
This report covers:
• Trigger adjustments.
• Discovering the maximum fill pressure.
• Shot count.
• Velocity with various pellets.
• Discharge noise.
In this report, we’ll discover the Shamal’s pressure curve, which will be instructional for all who are new to precharged airguns. As I mentioned in the first report, this rifle didn’t come with a manual; so when I got it, I had to discover the pressure curve on my own. I did, and it turned out the rifle wanted an initial fill pressure of 2,600 psi. That was on the gauge that was on the fill device that came with the rifle — the device that I no longer have. I need to find out where on the gauge of my carbon fiber tank the needle wants to be when the rifle is full. These small pressure gauges are not that precise, so the number could be off by several hundred psi. Also, the gauge on my carbon fiber tank isn’t marked in hundreds of psi. There will need to be some interpolation involved.
More than a decade has passed since this rifle was mine. I’m not sure where it’s performing today. So in all respects, this is a brand new air rifle to me. That will benefit you if you want to look over my shoulder while I do what needs to be done.
Before I get into that, however, I first want to address the adjustable trigger. Shamals haven’t been around for a long time and there isn’t that much written about them. I want this report to serve as an owner’s manual for all who get one in the future.
The Shamal came with two different triggers — a standard one that my rifle has and an Olympic trigger that sounds more adjustable, but which I know nothing about. My trigger has 4 adjustment screws. From the back to the front (holding the rifle on your shoulder) they are:
1. The sear engagement (clockwise to reduce).
2. The first-stage travel (clockwise to reduce).
3. The first-stage weight (clockwise to increase).
and in front of the trigger:
4. The second-stage weight (clockwise to increase).
Trigger-adjustment screws: (1) Sear engagement, (2) first-stage travel, (3) first-stage weight and (4) second-stage weight.
When I tested the trigger with my electronic gauge, the firs-stage weighs just under 6 oz., and the let-off was between 12 and 14 oz. The first stage is long, which I like, and the release is as light as I like a trigger to be, so I’m satisfied with this trigger as it stands.
Discovering the max fill pressure
This is something that has to be done whenever a new gauge is used. I had data from previous tests that told me the fill pressure should be 2600 psi, so I filled from my carbon fiber tank to 2750 psi. That gave me the following velocities with the same 14.3-grain Crosman Premiers I used over a decade ago.
The fill pressure at the end of this string was 1500 psi. This string tells me almost everything I want to know about this rifle. First, the fill pressure I used was way too high. I’ll fill the gun again to a much lower pressure and see where that gets me.
Next, there are just under 20 good shots on a fill — down from what I thought so many years ago. I like the velocity that runs from 780 to 806 — a spread of 26 f.p.s. Looking at the curve for Premiers, I should start with shot 18, although the shot before that didn’t record, so I can’t be certain whether it was any good or not.
If I end the string at shot 34, I’ll get 17 full-power shots close to my desired range. What should the starting air pressure be? That’s solved easily.
I’ll guess that 2350 psi is the start point. I filled the rifle to that pressure and got the following results.
Okay, as the pressure inside the gun has decreased with each shot, the velocity has increased. The last shot was 781 fps, which is as low as I want the velocity to go on the power curve I’m willing to accept. The gun’s reservoir pressure has now dropped to the maximum pressure that will give me a velocity on my desired power curve (781 fps).
The velocity of 781 is at the bottom of the power curve that I have identified for this rifle. Since my last shot was 781, the rifle is now on the power curve. The pressure in the reservoir is now at the highest it can be and still give me the velocity I want. From this point on, as the rifle’s reservoir pressure drops, the velocity will either increase or remain stable. As long as it’s at 780 fps or higher, the rifle is on the power curve I’m looking for.
Now I can find the ideal starting fill pressure for my desired velocity range. All I have to do is start to fill the airgun, again. When the needle stops moving fast, indicating the fill hose is full and the gun’s intake valve has just opened, I stop the fill by closing the tank’s valve and look at the needle. The needle is pointing at the air pressure that is in the gun’s reservoir. I can see on the gauge that this rifle likes a starting fill pressure of 2250 psi!
To confirm that I’m right, I fired one more shot with Premiers. It went 781 f.p.s. Bingo! I’m right at the start of the power curve, with at least 16 more good shots in the reservoir.
I also discovered that the rifle performs very much the same as it did long ago. I’m using a different chronograph, yet the velocities from the late 1990s and today are within a few f.p.s. of one another.
The power curve I’ve accepted gives me an average velocity of 792 f.p.s., which is good for 19.92 foot-pounds of muzzle energy.
I will now test the velocity of other pellets, but I’m not going to shoot long strings and get the averages. I will shoot 2 of each pellet and take the lowest velocity of each pellet as the average for that pellet. While that’s not exact, it’s far faster than shooting whole strings and averaging. I know I’m on the power band for the next 16 shots; and if I use even fewer than 16 shots (4 pellets x 2 shots each = 8 shots), I can be sure that all of them are on the power band. The power band is the place where the velocity of any pellet will vary the least.
Eun Jin domes
This 28.4-grain Eun Jin dome pellet gave me velocities of 592 and 586 f.p.s. Taking the lower number as the average, I get a muzzle energy of 21.66 foot-pounds.
The Beeman Kodiak pellet weighs 21.14 grains and gave me velocities of 683 and 680 f.p.s. That’s very close to the “magic” velocity of 671, where the weight of the pellet in grains equals the energy in foot-pounds. Using the low figure of 680 f.p.s., this pellet gave an energy of 21.71 foot pounds at the muzzle.
JSB Exact Jumbo Monsters
Next, I tried JSB Exact Jumbo Monsters — a 25.4-grain pellet. They gave me velocities of 584 and 611 f.p.s. Using the lower number, that’s a muzzle energy of 19.24 foot-pounds.
The bottom line is that this Shamal is a 20 foot-pound air rifle as it’s operating now. That’s what it was when I owned it in the 1990s. So, the rifle hasn’t changed, but the gauges have changed and so has my perception of the total number of shots that are available. So, this update was important to the operation.
I don’t know what I was thinking when I reported the Shamal as a quiet air rifle before, but it isn’t. It sounds exactly as loud as a .22-caliber Benjamin Discovery running at the same power.
Someone asked about the loading room at the breech, and on this rifle there’s a generous amount. There’s no loading trough, so it’s easier to get your fingers behind the breech with a pellet. And all pellets load easily because there’s no rifling at the breech. Rifling doesn’t start until after the air transfer port, which is deep inside the breech. The bolt nose has a long probe that pushes the pellet past the air transfer port and into the rear of the rifling.
That’s a 28-grain Eun Jin standing on the receiver. It’s one of the longest .22-caliber pellets around. As you can see, there’s plenty of room at the breech.
That’s it for this look. Next time I’ll scope the rifle and head to the range.