I just bought, (but haven't received yet) my first action to start a long range build and before I get to far into it, I thought I'd make a return to this forum for some input and/ or suggestions. I'll preface things by stating that my experience, while limited, has been growing exponentially over the last 3 years. I am to the point where I consider 800-1200 "mid-range" with my 300 SAUM and 210 Bergers. (Armalite AR-10T that I've dubbed, The Ultra SASS) The plan is to build an 8twist 7mm SAUM with a 26" Shillen select match. The action started life as a 300 WM and as such, I assume its got a .532 bolt face. First question...is the .534 rim of the SAUM going to fit that or does it need to be opened a lil bit? I'm not sure how big the actual factory bolt face is. EDIT:... Found the answer to this one. Second question...anyone have a line on a 20-30 MOA one piece rail for this action? All my research has suggested its screw pattern is different than the pre 64 short actions and the post 64 long actions. Third question...bottom metal. Anyone making bottom metal for this bad boy? Or...I've considered having XLR inlet an evolution for it. That's about all I can come up with for now. What say you?