I went to range yesterday to fire a few shots to generate some brass to send to Warner to make me some dies for this gun, .375 CheyTac. Anyway, the recoil didn't seem too bad but I noticed when shooting that my sinuses were starting to feel weird. Later, it was worse and it's still bothering me today. There's a bit of pain and sort of a swollen feeling. It's almost like I can smell or taste something. I used to shoot 50 foot indoors so I'm very familiar with those kinds of smells. This is different. Anyway, on thinking about this, the lanes where I was shooting had Lexan partitions between each bench. The muzzle did not really extend past the ends of the partitions so I think that the muzzle brake was directing the muzzle blast right back into the bench area. Has anyone ever heard of a sharp explosion like that affecting sinuses? Yeah, I know, sounds crazy.