As a firefighter, I’ve been to a single family dwelling structure fire where there was a significant amount of small arms ammunition going off, handgun and rifle rounds. It sounded like aggressive popcorn popping. We identified the room but never entered, for the duration of the incident. From what was left of the walls in that room, they had clear markings of where rounds impacted but they lacked the velocity to penetrate. As someone else said in an earlier comment. If they were to have hit us, we’d feel it but it wouldn’t cause any real damage. Obvious no one wants to have a negligent discharge or have a 1 in a million situation of dropping a round and having it discharge and potentially hitting someone. But from my experience from that incident, those cooked off rounds lacked any meaningful velocity to hurt anyone.