but it does NOT take an external source of oxygen (atmosphere) for modern ammo to fire. lot less oxygen needed for powder combustion than folks think.
firing modern ammo in a vacuum does work. both we and the soviets researched this issue, in case the cold war "went hot" in space/orbit. heck the soviets put a defensive gun on one of their early space-stations using the same R-23 cannon as used in the tail turret of the TU-22.
Thinking the same thing myself after posting I had to look on the internet and found that the saltpeter in gunpowder is in itself oxygen rich. I also learned that sound does not travel in a vacuum so it would be quiet too.
Will that stop a bear? Why not a 50 or 44 mag? You would have more than 1 shot at a time, and it would probably be more useful, if they had them back then.
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