I have a pretty good idea of what a live 45 cal bullet looks like. I have no idea what a stage prop blank looks like, but can't imagine they look similar enough to mistake one for the other. Also can't see any reason why live ammo that would shoot would be anywhere near a movie set, or that a "gun" used on a movie set is a real gun capable of firing live ammo if it was.
Why would the not be using replicas with special chambers not similar enough to any live ammo that you could even chamber one?
If there is any legal fault, it would be with the movie industry that allows such a thing to happen.
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as I understand it they purchased live firearms because they could do that for less cost than properly modified blank firing only guns.
they would have paid more to rent the prop guns from a reputable movie prop gun house
they didn't maintain the security of the trailer containing the guns nor the ammunition crew members were going off into the desert shooting live rounds on their time not filming.
they used dummy rounds so that you don't see an empty cylinder when shooting the movie , they look exactly like live ammo but with no primer or a spent primer.
they didn't follow the rules they would have had in Cali
they cut corners , played it fast and loose , didn't maintain security , didn't resolve issues as they came up
They is the production company partially owned by Baldwin what we haven't heard and he no one seems to be saying , who made the decisions to do these things and who promoted the assistant to the armorer to head armorer.
it would seem that even if actor Baldwin isn't found negligent , producer Baldwin set the stage for actor Baldwins with gross negligence.
the question seems to be what hat should he be wearing when sentenced.