In article , JTMcC says...

I would think the effect of gravity
and wind resistance would determine the maximun velocity of the falling
bullet

The phrase is 'terminal velocity' and I suspect that for
any modern round fired straight up, this is indeed the
determining factor, so I would put my guess in line with
yours. As you suggest, there are others here who truly
know the answer off the top of their heads.

Jim

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