Were I some Hollywood star who made a lot of public pronouncements against guns, I'd avoid being in movies where guns were prominent (presuming I could afford it).
I'm not sure I personally know how to check a firearm for real ammunition relative to whatever Hollywood uses. In a revolver, they seem to emply something that appears like the real thing if a closeup is involved from the front.
Maybe the rear of the cartridges look different, one hopes they do.