WHOA! The man is talking about re-enactments. No live rounds fired there! The range officers MUST check each shooter to make sure he has no ball or bullet for his gun in his box, or bag. When we march in parades, for instance, and shoot off blank charges, our range officer of the day always checks each participant to see that he only has powder, caps, and wadding in his bag, and ABSOLUTELY NO ball or bullets. That protects the club and the shooter from liability for any possible injury.
Now, if you are putting on a shooting demonstration, with a proper backstop, firing line, and provisions to keep the spectators in a safe area behind the line, then by all means, Load the gun with powder, patch and ball, and fire away. My gun clubs has done shooting demonstations for years, and most of us have become experts at building temporary ranges on site.