I spent WEEKS trying out different ammo, tightening/loosening, shooting position etc to get my M to group with factory ammo. Best I could get it down to was about 1.5moa.
There are a few pics/threads of guys with good groups but they're usually 3 shots and hand loads. I was able to get 3 out of 5 shots touching with my M but the other 2 would significantly open up the group.
Battle rifle. Not a precision rifle.