you using weaver mounts with the cross bolt ,, or a good solid dovetail mount?...my dang m70 270 sm from wal mart came with weaver styles.. it shot good ,, for while,,,, i was getting pissed,, then i looked at all my other rifles and noticed i put good mounts on all of them..... i took the weaver base,, and seen where the alum.. was peening and shearing away...put the luepold bases on.. not a problem since.