I had a 300WM BAR once with the BOSS. Worst rifle ever. I was younger and thought that muzzle breaks were "cool". Stupidly, I took the rifle on an elk hunt. I took a shot at a cow just inside the treeline. To this day I blame a large portion of my reduced/sensitive hearing to that event. I'm not exactly old either. I've never had such a painful experience with my ears before or since. It ruined my hunt even though I got the cow. I recently tried to talk one of my friends out of buying a 7mm RM with a muzzle break on it. He still bought it but I warned him to find a thread protector ring and hunt with the break off. If he doesn't I won't be anywhere near him when he shoots it.