Skeeter,
With the 22 LR guns, you can only change the ammo. With the short barrel guns there is little attention paid to keeping the bore diameter within tolerance for accurate shooting, the short barrel gun simply is not expected to be accurate.
If your buddy's gun has an oversized bore you can increase the pressure in the round to help obturate (expand) the bullet's base. The way to do that is by going to a high or hyper velocity round. Try some of the real fast stuff, like the Stinger, etc. It might just help.
Ed
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"Is life so dear, or peace so sweet, as to be purchased at the price of chains and slavery? Forbid it, almighty God! I know not what course others may take, but as for me, give me liberty, or give me death!"
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