The big problem with firing a regular bullet in inside any thick hulled machine (tanks, armored car, submarine, surface vessel) is ricochet. This can literally shred the crew of a tank, and do some serious damage to the crew and equipment).
Lugers were notorious for being more powerful than most 9mils. The scene in Indiana Jones when he shoots the three Germans in front of him, is based on the reality of the Luger. It was quite a hand gun. God knows why.
Now, as far as the bullets. To my knowledge these soft bullets are in the side arms of submarine crews of Russian, and European boats (not sure about US, but I would hope so).
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