I'd stay real clear of a muzzle brake. A good friend has been shooting a 300Win with a break for years. He's a little hard of hearing now. It seems that you trade recoil pain with hearing pain. Either will develop into a flinch. The 7mm mag without a break, or step down a notch to.30-06. You can get reduced recoil loads in both I beleive, and you can step the load up a little as you feel more comfortable.500 yard shots?????