I worked gun shows for about 5 years. I heard 4 rounds go off. Not working but visiting gun shows I heard one detonation. It was a bag of 45 reloads hitting the floor. I was 10 feet away from that. If I had not seen it, I would not believe a bag of 45 acp falling from a table onto the floor would detonate multiple rounds. I saw fragments from at least 2 rounds on the floor.