Railgun rounds are magnetic, they 'float' on the rails that carry the charge that projects them (I think Mage is right about them being tungsten). They are currently working on working models of them, the main draw back right now is the power source (they require a huge amount of power). Current power plant/ capacitor systems for them are the size of a small house. Its the same problem as with the lasers they are working on getting mounted on AC-10 gunships, they have to shrink the power source. If you have a library that stocks Popular Science there was an issue a few months back that had a cover story on advanced weaponry that talked about them as well as some of the new laser applications.
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In the words of Jello: "Punk ain't no religious cult,punk means thinking for yourself. You ain't hardcore cause you spike your hair, when a jock still lives inside your head."
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