Not your typical AD...even the range guys were shocked. I was in the middle of bringing pain to a target when there was a bright flash right next to me and I felt something on my arm. I put the gun down and looked to my right where I keep my ammo on the bench. There were bullets still in the tray surrounding the explosion but they all shot just fine afterwards. Here's the tray and leftover round The tray was sitting on a full box of ammo....the bullet had partially lodged into the unopen box and rested on other bullets Here's the one that blew This is .40 S&W ammo and I was shooting it out of my Steyr M40-A1. An interesting note about the Steyr is that it throws brass straight up in the air when ejecting. Apparently, this was a freak incident and as you can see on the primer, an empty casing that bounced off the ceiling tile hit it hard enough make that kind of dent and set off the primer. We even put the rim of a cartridge over the primer and it's a perfect fit. I didn't get hurt, just got sprayed with unburnt gun powder. Very very weird.