Nah, lot's of modern defensive handgun ammo uses flash suppressed powder. It would be loud, but the difference between this and a 9mm or 40 in an enclosed space is not nearly as much as the difference between this and an AR pistol, which actually would seem like a flash bang.One shot in a dark room and that would be like a flash/bang grenade
Well crap. Guess the 10mm collection grows a bit.