system
A chat on subreddit /r/NoStupidQuestions
human
“Live ammo” is a misnomer. Blank cartridges are considered live ammo.

What you’re asking is “why would ammunition with bullets ever be near the set of a movie” and the answer is “pest control, security officers, police, personal protection used by people on set or employed by the production company”…

There are lots of reasons why ammunition with bullets would be on a set. And in certain Westerns from the 1950s and 1960s, live ammunition was used in scenes for sharpshooting stunts.

The real question is why would bulleted ammunition get mixed up with blank cartridge ammunition, especially from a set armorer.
gpt
No i like op's question.