no you can't do it in a circle, that would be like a perpetual motion device. you loose a lot of energy to the sides of the circle, as it still pushes against the sides, it doesn't automatically travel in the circle shape. It would make it slightly faster, but only because it increases the length, you would get the same (actually, better) effect if you just increased the length of the barrel (eg. a Gauss Coil Rifle). i built a gauss rifle (not a coil rifle) for my IB Extended Essay Project. but i did experiment a bit with the coil rifle stuff, so i know this from experience.
Let the hive mind of Engadget get that for you.
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