chamber yourself a .277 in roy fashion in the action you like; hang 26" of bbl on it and run 130's (think accubond,interbond,etc BC .435 plus) at 3500. Its not a feat to do so safely. 7828 is your huckleberry. No 270win AI, 280 rem AI and maybe not a 7RM gonna touch that. Dont forget your freebore. You might be surprised how well it'll shoot.