I'm thinking that even without a brake on that .300, you'd have suffered perminent damage.
Need? NEED?!? Dude, do you really want me to go through your life removing everything you don't need? If someone wants a brake, and after considering the trade-offs still wants it... more power to...
I would love the ability to use a sound suppressor while hunting.
Until that joyous day comes, I wear one of several electronic hearing protectors when hunting with anything louder than an 18" barrelled .22LR.