I own several rifles with muzzle brakes. The volume of the crack/boom varies with the caliber. An AR I have that is braked is pretty loud. But my 300 W/M Browning BAR is my king of loud. It has the BOSS brake/tuner on it. When I fire it at the range I notice all on the line are looking at me. Loud brakes are also a good way not to have anyone using the benches next to you. Just kidding....or maybe not.