So I have a .308 T3 in stainless heavy barreled which I have been chasing an issue where it wasn't grouping properly and rounds were flying big time, found the issue were the action screws had worked loose, quite a common problem im led to believe.
now that ive got it back on paper without the mod, I can get it to group 1" no problems.
The issue is when the mod is put back on, they fly all over the place, Ive checked the mod to see if its been clipping, no signs of anything. the group is large looks like ive use a shotgun because they are spread over the target and have move POI about 8" from where it would group with out the mod.
anyone any ideas what else to check
Im thinking having it recut and re crowned and starting from scratch.