[Fido969]

The protocol for dummy rounds, which can’t be distinguished visually, is to point the gun at the ground, away from any person, and pull the trigger (or in the case of an SSA, cock the hammer and pull the trigger,) as many times as there are cylinders.

And a couple more times for good measure.

Had that been done with the gun in question, any live round would have been revealed before a dangerous situation occurred.

[jagusafr]

Or, for better safety, have a clearing barrel on set.

[hanamizu]

“...The protocol for dummy rounds, which can’t be distinguished visually,...)

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Why would a dummy round need to look like a live round? You shouldn’t want anything denser than a wad (which can be deadly at very close range) coming out of the barrel.

[libertylover]

which can’t be distinguished visually,

Really?

Had that [fire into the ground] been done with the gun in question, any live round would have been revealed before a dangerous situation occurred.

Well, yes but then you have to load in more, hopefully blank, ammunition for the movie scene. What about the new ones?