Is this with factory ammo? DOes the brass show scrapes on it when removed from the rifle? If it is relaods you are shooting- STOP firing them as that is consistant with overstretched brass!
Currently...Sako TRG 22, Model 29 .44 Magnum, Beretta M9 9mm, Beretta Neos, Colt AR 15 x 2, VQ 17 M2, Anchutze .22 hornet, the ultimate 10/22, LOTS of M1 Carbines.
"Beware of the Man with one gun...he probably isnt into guns enough to be safe with it".