Once, in the far,far distant past, I was in a mess hall at Camp Lejune when the prisoners were brought in to a segregated area of the mess hall by prison chasers. This was an every meal occurance. Must have been four or five hundred in there eating at the time. One of the prisoners broke and bolted for the door (no idea where he thought he was going). A chaser stepped into the isle and racked that high brass 12 gauge through that Winchester. Suddenly you could hear a pin drop and all of the tables in that mess hall were empty & every one was on the deck, including the runner who was shaking like a dog trying to pass a razor blade. That sound carries over just about any sound.
Having said that, I subscribe to the theory that guns, like knives, should come as a suprise to the reciever....