So I am starting a my first long range build on a savage 110 action. Question I have is that I just traded into an Accurate Mag DBM that came off of a Savage HS precision 338 which should be here today or tomorrow. The issue is that the mag opening in the bottom of my action is 3.715" and the DBM is for the 3.850" mags/opening. I have a tooled up knee mill and am not afraid to use it. Is there anything special with the actions with the 3.850" opening? Can I just open it up the 0.135" on the rear side of the opening and be gtg? Not really set on a caliber yet if it makes any difference. But I am leaning towards either the 30-06AI as I have a few '06's and reloading components already or the 280AI as it looks like a fun caliber that has some nice reach.