This is the part that I totally disagree with. If I was the armorer, I wouldn't let the "actors" mess with the guns, except to use them in the scene. As soon as an actor opens up the gun, or start pulling out the bullets, and putting them back in, you no longer know what bullets are in the gun.
An actor could pull out the blank round, and replace it with a live round, under the guise of "due dilligence", and when he ends up killing someone, claim he was no expert, and couldn't tell a live round from a blank, since .45 long colt blanks are made to look like live rounds.