All my experience with the .338 x .378 is on MK V actions. I don't know much about the Stiller actions or detachable mag bottom metal. I have installed an extended Watt box.
Check with HSP to verify that they make a MK V stock for a heavy barrel. Several years ago they didn't. Bell & Carlson I believe does. It would probably be a "Medalist" or "Threat Response".
Cell is (979) 373-8989. Will help you if I can.
Check with HSP to verify that they make a MK V stock for a heavy barrel. Several years ago they didn't. Bell & Carlson I believe does. It would probably be a "Medalist" or "Threat Response".
Cell is (979) 373-8989. Will help you if I can.