1000%
and a women actors may not be familiar with guns anyway.
in europe, there is always a special firearm guy on set (or has a deputy), being responsible for everything related.
it needs to be understood, actors are just ordinary "dumb" people, not a weapon geeks.
btw, why are not used airsoft guns instead, todays replicas are so real.
One need not be a "weapons geek" to be trained in a basic function of his/her job in handling guns.
If your job duties include, "pointing guns at people in a movie" you darn well better believe it is YOUR responsibility personally to ensure the guns are safe. Period. Yes, others are also to blame. But the final blame is with the handler.
As I mentioned, a 10 year old of average intelligence can be shown how to inspect a gun for either an empty chamber, or be shown the difference between a blank and a real live round. If an "actor" is going to be playing with guns on a set, it's fundamental he/she would be shown this and expected to have some accountability.
I cannot imagine another profession where one would not be expected to learn a simple life saving task. This is not a big ask, IMO. Open the cylinder, and look. Open the gates, and spin the cylinder, remove and replace each round to make sure it's a blank.
If anyone can read and understand this, you already know more than apparently many people on the set of Rust, including Baldwin.
Bullets have 4 components. Bullet, powder, primer, and the casing. To make a blank, there is no bullet, and the casing is crimped, and the powder charge usually reduced. This adds to realism, recoil (often needed to operate semi-automatics and automatics), noise, flash, etc. To make realistic looking ammo, there is no powder and the casing is generally drilled or pinched in a way to identify them. Or ammo can have the bullet and case to look real but no powder and no primer.
Again, a 10 year old level of understanding, and totally fundamental for anyone touching a gun, including actors, where guns and blanks are used. In my military career we used blanks often for training. Nobody was allowed to bring or handle ANY live ammunition in the training or prep areas, and our guns were fitted with blank adaptor devices on the ends of our guns as a extra precaution.
For visual aid, here's what you'd look for.
Empty: Totally safe. This takes 5 seconds.
Double Action, empty
Single Action, apparently being used on the Rust set: No more than a minute with slightly different but same principle for a single action revolver. This chamber is empty, but one must spin to check all chambers.
Single action - oh what do we have here. This is a bullet. Better take it out and see if it's a dummy or live round. Whew, glad I checked. Let's inspect the other chambers! Hold on while I take 1 minute to do this basic safety check.
Difference between real ammo and blanks is obvious to inspect. Examples:
Live
Dummy, can be crimped with or without powder, or removed powder and removed primer with a bullet remaining. Examples.