Discussion Starter · #1 ·
have a gamemaster 760 pump in a .270 (new to me) but the shells that I bought for it don't seen to chamber correctly. they seem to be too long - they measure out at 3.3 inches in total length, casing measures 2.5 inches. when I pump the shell into the chamber I can't get the pump fully extended and the breech seems to still be open since the bullter only seems to seat about 80% into the bore. Am I using the wrong sized ammo?? baffled, but new to the rifle (or anything larger than a .22 for that matter) so its not a suprise...