How to Stat Ghost in the Shell Style Hypervelocity Ammunition

[Rupert]

Originally Posted by GURPS Fox

As far as I know, the absolute limit for 'conventional' gunpowder (i.e., nothing that uses things like electrothermal chemical propellants) is 1.8km/s.

It has to be higher than that, because modern tank guns reach that and they have massive muzzle blasts, so there's plenty of energy and pressure still in the propellant gasses.

The Russians are claiming a little over 2 k/s for their new 125mm gun and ammo, but that being hype and exaggeration is quite possible.