Apparently not effective. The industry is guilty of allowing retarded actors handle actual firearms when there is no justification. Either switch out the gun or switch out the actor because together they are a danger. Let them use dummy guns, even the blue rubber ones. The editors can add any effects later with CGI. Needing to "get a better shot" doesn't justify allowing retardates to risk others' lives.
The irritainment industry has such a deadly tragedy about once a decade:
Jon-Erik Hexum accidentally shot himself in the head with a blank round after jokingly putting the gun to his head. (1980s)
Michael Massee killed Brandon Lee by firing a gun with a blank that had a live round stuck in the barrel from earlier. (1990s)
Rapper Keaway Lafonz Ivy was shot while filming a music video in Washington, D.C. with what was meant to be a prop gun. (2010s)
Alec Baldwin shot Halyna Hutchins. (2020s)
Every Western, War movie, and Action movie for the last 70 years has actors pointing weapons at other people and pretending to shoot them. It is what they are required to do.
That is easily 100,000 scenes with actors doing that. Four deaths in 70 years? That is nothing. More actors have died in helicopter accidents. The safety record for following the 79 rules of "Industry Safety Bulleting #1" is way better than the "4 Rules of Gun Safety" that you see posted at the local shooting range.
Rules only work when people follow them. Many activities in the film industry are inherently dangerous, and crews are very good about following safety rules.
Well, except for the people on the set of "Rust". The smarter ones bailed out the day before the incident. Good for them.