@Sameagle
So no... There was no possible mix-up with live ammo.
Reports from the stage crew (and one of the reasona for them walking off set) was that the guns had been used during filming downtime to target shoot, using live rounds. The #Armourer is supposed to keep guns locked up when not in use, so this would have been another safety violation.
Most likely, someone doing that target shooting left a live round in the gun, and left more live rounds nearby.
