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I just ran across something I had never heard of before: The Russians, during the Cold War, developed something called the Closed Circuit round. It had a tiny bolt inside the shell to kick the round out, and an insignificant amount of gunpowder was all that was needed to drive that miniature bolt. Usually they had to be tapered casings. They were first produced in 7.62, but eventually were produced in all major calibers. They were classified weaponry in the Soviet Union, and were a much lighter load because they dont need as much powder -- the gas pressure never leaves the shell. Its just enough charge to send the round out at 900 fps. The only sound heard is the click of the hammer and the pling of the ejected casing, and the whining whoosh of the round downrange.