Easier to develop slow and heavy first. Just look at the .45acpNeat,
I'm not sure why the designers insist on a 600 grain projectile. It would be much more effective as a 20 grain projectile travelling at 3000m a second than a 600 grain projectile travelling at 70m a second.
There's going to be limits on how fast they can trigger the coils, too. They probably aren't running into those limits at 70m/s, but dunno if they could trigger fast enough for 3000m/s. Realistically 700m/s would be plenty.
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