I built a .22-250 AI, purposed for predator hunting. 22" Bartlein 1:7, 3B contour, Rem 700 action, Magpul Hunter stock. It's a "budget build." I haven't tested the 77g Sierra bullets, but this rifle really likes 73 g Berger BT target bullets, and 42.5 g H 4831SC, for a MV of about 3250 fps (a...