I had a muzzle break on a 30-378 some years back. That was the only rifle I've had that I thought it was justified. It sucks to have to wear hearing hearing protection during a hunt you are only likely to take on shot with--with the muzzlebreak on that rifle, that's what I had to do it was so loud. I'm ok with the recoil of the 300wby and 340wby without a muzzlebreak. I'm sure I'll handle the stw.