RE: Muzzlebrakes?
ALthough I fabricate and install muzzle brakes, I always try to talk the customer out of it. For about the same money, you can get one of those Caldwell Lead Sleds - sight the gun in without pain - andI never feel the recoil when hunting anyway. The noise and muzzle blast of a centerfire big game rifle is very hard on one's hearing anyway, and all muzzle brakes make this worse. Consider using a lighter caliber, or get the Lead Sled.
If you must have one, the best is a Vias. Get a thread protector to use when hunting without ear protection. Roskoe.