The U.S. Navy spends its money well with tangible results ( an understatement). They have a working "Mach 7 Rail gun". Mach 7 is roughly 5000mph or 8050 kph.
Does anyone remember the Arnold movie "Eraser" well that was a handheld rail gun this one is not. Which poses the question of " When" is still a long time away. But remember the first mainframe computer which was roughly the size of one city block and now we have smart phones.
Please go to the links below
http://news.cnet.com/8301-13772_3-57387939-52/navy-tests-railgun-that-can-shoot-up-to-100-miles/?part=rss&tag=feed&subj=
http://techcrunch.com/2010/12/10/navys-mach-7-railgun-fires-a-round-at-33000-megajoules/
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