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Originally Posted by Fred Brackin
I'd ahve thought that the biggest problem was that above 2200 meters per second your projectiles are behaving like meteors buring up from air friction and exploding when they hit the target.
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That only works if your projectiles are low in density, when your projectiles have a high density (like, oh, somewhere between 15g/cc to 20g/cc), you have an upper limit of 15km/s (where atmospheric friction is so great that the projectile
instantly explodes) or at least from what I can tell.
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If you can get coilguns into this speed range they might still be attractive in vacuum due to their relatively low amont of waste heat.
Your projectiles are probably excessively heavy too.
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That's what happens when you need as much kinetic energy as possible and have your projectiles be tungsten/DU dense (at a minimum) outside of artillery shells. In addition to the anti-tank projectiles having a Width-to-Length ratio of 40 (aka the best for long-dart APFSDS).