I recently required an old FN branded Mauser action. The action has been re-barreled for a 25-06 with a Shaw barrel. This rifle doesn't shoot as well as I would like it to. I was curious if anyone could provide any information about the possibility of anyone offering a prefit barrel for this action? I know nothing about Mauser actions. I've seen something online about big ring or something like that. Someone, at some time, has done a substantial amount of work on this rifle. It's had the Mauser type safety relocated to a Remington 700 style, Leupold bases and rings installed, and dropped into a B&C stock. It's a nice rifle as it sits, but with 3 to 4 MOA groups, that isn't up to par for me. Any information is appreciated.