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avantman42 - it is "contemporary". ie. approximately now.
As I said in the OP, I've seen the videos - they're very pretty, there's even a man that makes "flowers" from shooting hollow points under water. (There's even an article that suggests that parts of an AK-47 work better under water.) But things change when you go deep. The pressures get high very quickly. There must be some point at which the pressure of the water will slow down the bullet so much that pressure from exploding round (if it will fire at this depth) will stress the gun. Or is the pressure so evenly great that gun can still withstand the explosion and perhaps fire the bullet a few inches. My maths isn't bad, nor even my basic physics, but I'm not up to working out how great depths may effect the workings of an automatic rifle.
The idea that the gun may jam when trying to eject the empty is interesting. That on it's own may be enough for me to change what I had in mind - as it does seem very likely. It was only an idea I had to explain something that happens later, I may have to find another way.
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