I have a 300winmag Ruger with a Boss style tamer on it. It is very loud at the range (so I am told)but when shooting in the field I don't notice it. I always use ear protection at the range. I don't know if I would put one on my next mag rifle. I have heard where some guides will not allow muzzle breaks.

My muzzle break takes it from a mean mule to a nice 30-06.