Really? We're bringing this one back after almost 3 years? not the record but still not a great idea....oh well...
Between 5 and 6 thousand fps has been achieved with gunpowder. That's about the limit for gunpowder.
If you want to go faster, its rail gun tech time.
There you can get the highest speed possible on earth. Escape velocity. And a bit beyond I think.
We haven't done it, yet, that I know of, or at least not outside a lab.
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All else being equal (and it almost never is) bigger bullets tend to work better.
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