I've shot medicman's 45-70 contender, and the muzzle tamer ports on that barrel are necessary when shooting the 500 grainers at warp speed, believe me. I wear hearing protection every time I am at the range, so no biggy.
I have a B.O.S.S. equipped Browning in 300WinMag, and to begin with, I just had the ported BOSS, and I shot several game animals unprotected in the ear department. WOW! It was LOUD! Almost painful. It shot like a dream, and the recoil was about like a 243, but my ears actually hurt after only one shot. I got the CR model (Conventional Recoil) and although the recoil is a bit more like a 300 Magnum, at least my ears don't bleed when I shoot it.
