I am an Ear, Nose, and Throat surgeon (Otolaryngology) and hopefully can shed some light on this article. Concussive trauma that is transmitted though the bones of the skull (not the face) causes a type of hearing loss called conductive hearing loss as a result of dislocation of the middle ear bones (ossicles) or perforation of the eardrum. This is seen with explosions that have a very concussive air pressure and sound pressure that cause that kind of damage, like a bomb. Perhaps there are some rifles with brakes that could do this, but I doubt it. To find out if shooting with a braked rifle causes conductive hearing loss you would need a formal audiogram. I have never seen this in my practice on patients that shoot a lot. It is always the noise induced nerve hearing loss not conductive hearing loss. Now, it is possible that an extremely loud gun can cause noise induced hearing loss in spite of wearing hearing protection, especially if ear muffs are not used. Sound waves from the blast also hit our skull, particularly the temporal bone and these sound waves are transmitted to the cochlea (hearing apparatus) and then passed on to the hearing nerve and brain. In fact, when we test for conductive hearing loss the sound is presented directly to the temporal bone. When we shoot, however, that loud sound of the shot is distributed over the entire skull so you can't say that all 140 dB are passed on through the bone. I don't know how much exactly but it isn't a lot. Wearing ear muffs I think is extremely important and the more they cover the bone around your ear the better off you are. We all should do everything we can to reduce our exposure to the noise our guns make. Shooting suppressed is better, of course. But shooting a braked gun is not going to cause conductive hearing loss as this article states. Hearing loss due to loud noise exposure of the magnitude we are exposed to with guns happens over time and takes months to years to developed, unless it is a very loud blast without any protection at all. Who knows, maybe, his hearing loss just happened to manifest the year he started shooting the braked gun in comp.. Another suggestion I have is to do what you can to reduce that loud blast when you shoot. I put a soft foam sleeping pad on the bench or floor to absorb the blast. I also put a lead filled bag on the ground between my left ear and the brake of the gun to block as much of it as I can. I have seen other shooters at the range look at me weird with my set up. Oh well.