Another big problem is that the rounds in a railgun have to be non-megnatic. So you couldn't use any metals. Even aluminum is to reactive. (Almost, if not everything, is magnetic if enough force is applied. I remeber seeing on the discovery channel about an some university making spiders float with VERY powerful magnetic fields.) The rounds would have to be made out of some sort of plastic. Course no plastic is strong enough right now, so you have a rail gun that works but the round shreds the second it comes out the barrel.
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