CFJunky: I enjoyed your read. Shows a lot of time and work invested. I would like to ask how you got such good groups with the 77 grain SMKs. I have two mod 10s with Boyds target/varmint stocks. They are both factory 1/9 twist and stop at 69 SMK. They won't even think about shooting 68 or 75 grain Hornady ELD ms. The 69s will shoot consistently under 1/2 moa, but heavier just drops off the cliff. They are both due for rebarrel and I'm thinking about a 1/12 and maybe a 1/7.5 to do light and heavy bullets. They just won't do it now.