Fair enough, but doesn’t a dummy round used on a movie set have a big hole in the empty case, and lack a primer, and have conspicuous markings like red nail polish on the case head to confirm it is innocuous?
Best practice would be for dummy rounds never to be used on set except in a close-up scene where the camera needs to see the bullets in the cylinder of a revolver, or being loaded into a magazine, and never to have the hammer cocked or trigger pulled while they are in the gun. I’d go further and insist that the dummy rounds be loaded by the armorer with a press right there on the set, and destroyed immediately afterwards.
Just trying to keep the terminology straight.