Canadian Airgun Forum

A Minute of Angle is just over 1" at 100 yards at 25 yards it is only .261".
How can you measure .375 of an MOA at 25 yards. That is less than 3 mm

Robert

In the powder burning world. Bull Barrels or thick barrels help in a few ways.

The deal with heat generated when firing better. Not an issue with airguns.
They reduce recoil a bit. That would be a benefit with springers.
They are stiffer, reduce vibration. That would help.

Loosing the accuracy of a LW choked barrel by replacing it with a thick barrel might be a step down. If you really want a thick barrel you might think of having a thick metal sleeve made to slip over the LW barrel. Giving you the added thickness while retaining the LW choked advantage

Not all L/W bbls are choked, and until the O/P identifies what he has, this discussion is actually sort of pointless.

The L/W bbls that are choked can be a bit fussy when it comes to pellets. If the O/P's L/W bbl is choked, moving to a high quality competition grade wad cutter pellet will work wonders.

-D.S.

You are within 1 MOA, your less than 1/2 MOA.

What gun and what velocity are you shooting. A detuned sub 500FPS high end gun can be blown away by a high velocity gun costing much less.

A thicker, longer barrel may help. It does in the powder burning world. But there may be other cheaper, easier options. Like maybe a regulator, or a change in pellet.

Tell us what you are shooting. Gun, pellet, velocities (Chrono data). You may get some helpful suggestions

I guess we have to assume the OP is using the most accurate pellet for THAT particular barrel.
Producing 1/4" MOA groups at 25 yards for a 50 shot group is quite amazing, imho.
Or - is that 10, 5 shot groups? 5, 10 shot groups is not a 50 shot group, not even close.
I have 3 PCP's that shoot 1/2" at 55yards. That's a little better than 1 MOA - for 5 shot groups.
I'm happy with that. It was a switchy wind that day, but I did not have wind flags out.
One is a Lothar-Walther barrel, on the Condor. One was an Aselkon MX9 and the other is an FX Dreamline, all .25 cal.
1st and 3rd shooting JSB Hades pellets and the Aselkon likes the JSB 33.95 gr. Exact.
I have one springer that shoots 1/2MOA at 20yards. That's 1/10", 5-shot groups. Those 3 PCP's do better than that
for 5 shots, but not for 10, let alone 50 consecutive shots on the same target. That would be an endurance test of
the shooter, not an accuracy test of the rifle.
A rifle accuracy TEST of that many shots, would be more accurate if you used 17, 3-shot groups all averaging 1/10",
not 10, 5-shot groups and especially a single 50 shot group.

When I am tuning for accuracy I am shooting @50 or 100 meters.
5x5 rings 5 shot groups and documenting the group shape.
Shorter then 50 something like 20 or 30 meters I don't like, it doesn't "read" clearly.
But that is just me...

I've re-thought my commitment to keeping the make of my air rifle out of this as it makes the discussion awkward. So please, if I am being unfair in wanting better precision than .45 MOA at 25 yards from my rifle please let me know. I've got an Air Arms S510 XS in .22 cal. It has a choked LW barrel. I've tested every type of .22 pellet I could get my hands on. After thousands of pellets shot in testing (loving every second), I can confirm that it prefers the Air Arms pellets it was designed for. The 16gr and 18gr Air Arms shoot so close that they are virtually indistinguishable. If I remember right it is shooting the 16gr around 910 fps and the 18's around 880 fps. The JSB Jumbos and H&N Baracudas also shoot well in those weights. I've tried a whole bunch of light weight slugs and none of them shoot, as expected. I have never considered shooting wad cutters. Can they make the leap from 10m to 25 yards? I was going to say that I don't recall seeing any, but I'm on the AGS website staring at them so there you go. A new pellet to test! Thank you for the suggestion.

Hi Robert. I'm measuring these 50 shot groups using OnTarget software. I shoot 50 consecutive targets on a single sheet, scan it into OnTarget, and then it takes me between 5-10 minutes to map the targets and impacts on the scan. The software then aggregates the series into a single 50 shot group and gives me a bunch of stats, including SD. OnTarget claims to be able to automatically map the targets and impacts for you if you are using a print out of one the target files they provide, but I have never got results with this that saved me time. If you want to test for small changes to precision - like determining whether cleaning your barrel has an impact - being able to easily aggregate 50 shot groups is invaluable.

BTW - I have not yet detected an increase in precision by cleaning my barrel.


Report this post

A Minute of Angle is just over 1" at 100 yards at 25 yards it is only .261".
How can you measure .375 of an MOA at 25 yards. That is less than 3 mm
Robert