Ask Brandon Lee that. He died on set when the prop guy got live rounds mixed up with the blanks.
Back in the 90's, and actor was killed on the set when he took a handgun he was using, that was loaded with blanks, and put it to his head while fooling around, and pulled the trigger. Graveyard dead!
I was in a wild west show at a local amusement park in high school. We used "real" Colt SAA .45's with blanks. At 10 feet, a direct shot on your chest would set your shirt on fire. Most of us had a hole burned through the right knee of our jeans from trying to "fast draw". Blanks arent something to mess with if you dont know what youre doing. We learned that lesson the hard way.
Dont put the muzzle of a gun loaded with blanks against a mattress and pull the trigger either. The one that was in the "jail" cell smoldered for days after someone did, and we finally realized it was on fire on the "inside", a couple of hours later on, and threw it out back.

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Guns don't just "go off".
You have never run tests on various guns, have you? Tell you what, go get yourself an older Model 10 Ithaca Deerslayer shotgun and try feeding shotgun shells that have high primers in them to the Model 10. If the Model 10 trigger disconnect is engaged because of dirt or whatever reason, you will startled yourself at how many times you can set off that shotgun without ever pulling the trigger.
Guns going off when dropped was the reason why drop safeties were required in modern semi-automatic pistols too. Over the years, people have done all sorts of testing of firearms and found problems with many of them which can cause unintentional shootings/firings. Sometimes just putting pressure on the side of some guns, like a certain Japanese pistols (Nambu) from WW2.
All firearms are mechanical devices that can fail at any time. It happens. There has never been invented a foolproof mousetrap nor a perfectly safe firearm.
Some of the older guns didnt/dont have the safety features most have today. The older Ithaca's dont have a disconnector on the trigger, and will slamfire if you hold the trigger and work the action. I still have a couple that do.
The Nambu's youre referring to, had the trigger bars exposed, and the story Ive heard in the past, they were sometimes used by surrendering Japanese officers, to commit suicide while handing them over. Deliberate acts. Not that someone unfamiliar with them, couldnt shoot themselves or someone else.
Something sure does sound fishy here though. At the very least, its not making much sense, and the story just keeps getting stranger, if it was a prop. Then again, maybe it was, and he was a dumb ****, and did what the other actor did, a couple of decades ago, and they dont want that getting out
As with most other excuses gun related, its always the guns fault when things go wrong. :thumb:.