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Old June 7, 2017, 10:09 AM   #8
random guy
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Join Date: February 28, 2017
Posts: 272
I think you've gotten your answer for conventional "gunpowder".

Railguns produce higher velocities using non-conventional propellants but it's really beyond anything that's on our horizon as individuals.

Sabot rounds (including tanks' main guns) get very high velocities simply because the projo is light for caliber. But then they discard their sabot and fly like normal, or even long for caliber rounds outside the barrel. That is technology that we should be able to use in small arms right now. It's probably just a matter of time before someone makes this work well and puts a lot of conventional HV rounds in the shade.
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