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Abrams main gun gets there with the DU penetrator of an APFSDS round only. The General Dynamics KEW-A1 has a muzzle velocity of 1,740 m/s (5,700 ft/s).
The issue with rifle bullets is mostly the bullet. A lead cored bullet cannot get going too fast due to the heat created melting the core. A solid is a different story though. You still run into instability caused by heat. I seem to recall some guy playing and got around 5,000 plus fps. Forget where or who though.
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