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All Springer/NP/PCP Air Gun Discussion General > China/Asian AirGun Gate

B26 .22 70Yds Target & Chrony Report

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grizzlyadams:
That is how i do most of my shooting too, door jamb rest, as most of the time when hunting, i grab a sapling for a makeshift rest for woodland critters

Allen Rice:
Come on, Allen.  Put that bench to work and show us some new targets.  We can't hold our breath any longer.

AR

gapi:
Long Time not active here. But will reply incase you still monitor. the gun not worthy on the bags. Artillery hold sensitive. Very. Bags grip too much.

 

splitbeing:
How are the standing shot groups repeating these years later? 

gloob:
You could likely shrink your group pretty close to minute-of-squirrel by shortening the barrel to 13-13.5" long for that velocity.

I've never seen a Chinese rifle with a proper springer barrel.

A springer barrel should be choked down extra tight for the first few inches before it opens up about about half a thousandth of an inch. The choked down part permanently sizes the pellet, then the bore opens up just a wee bit so that there's no drag the rest of the trip.

All my chinese and Crosman springers have a straight bore. You can check by inserting a pellet into the breech and pushing it down the bore with a rod. If it has a consistent drag all the way, it's a straight bore. If it's a proper springer barrel, it will practically fall through the barrel once it gets 3-4" down.

For pellet speed of 700 fps, 13-13.5" should be just about the optimal length. I have a Crosman .22 that shoots 650 fps, and it's really happy at 12.5". With that much length left, you probably don't even need to add a muzzle weight. My Crosman shoots great like it is. On my lower velocity rifles, the barrel gets shorter, and I need to add a blooper tube to put some weight back. The rifles start to get very hold-sensitive when the barrel is too short!

The barrel length formula goes by velocity squared, so by 400 fps the proper barrel length is ~4" long! 500 fps needs about 8".
 
Not that your grouping is bad for 70 yards. It's pretty good. Maybe your B26 has a proper springer barrel in it!

edit: whipped out a calculator. I would recommend 14.5" if your pellet of choice makes 700fps. Too short, and you don't lose much accuracy, but recoil can start increasing in a way that can loosen stock screws or mess up optics faster.

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