While I'm not trying to take money out of ATR's pocket, I don't like brakes much; I don't consider the reduction of recoil by redirecting muzzle blast towards the shooter a reasonable trade off. The real answer to obnoxious recoil is by handloading your ammunition. Lighter bullets and reduced powder charges are the best ways to tame a .300, or any other hard kicker. If you don't handload now, the cost of that brake will pretty much get you set up, and once you're handloading you can make ammo that is not commercially loaded. If you do handload, work up a recipe with an appropriate powder that will drive a 130-150 gr bullet at 3000 fps, and you'll still enjoy a flat trajectory without the drama associated with a full power 180 gr slug ahead of 70+ grs of slow burning powder. If that still proves too much to enjoy, then drop it back another 200 fps.