I very much appreciate all the feedback you guys have given. When I started this thread I was wanting more info about concussive effects than noise. If you complain about like loud noises at a gun range then it's probably not a good place for you to hang, kinda like the people who move next to an airport them complain about the noise from the planes. One of the places I shoot is a public range where there are only rifle 4 shooting stations and they're very close together and they're covered by a tin roof. I was out one day and had to move to the pistol range as the guy next to me had a ported 300 Win Mag and I could feel my hat move every time he took a shot. the noise of people shooting next to me doesn't usually bother me, but the concussion from that rifle was just too much and I don't want to me that guy just to have a cool looking muzzle attachment.