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The Navy is hoping that their newest 10 megajoule railgun (topping their old pathetic 9 megajoule) will replace the standard 5-inch guns on most of their ships. Projectiles fired at this energy level reach about 5,600 mph, but the Navy isn't stopping there. They have their eyes set on a 64 megajoule system capable of shooting at over 13,000 mph and hitting 5 meter targets from 200 nautical miles.

To give you a sense of scale, an 8 megajoule test shot has an impacting force that the Navy describes as being the equivalent of "hitting a target with a Ford Taurus at 380 mph.
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