Whoever is behind this is a huge fan of Quake 3 or the Arnold Schwarzenegger movie, Eraser. The Navy has been doing some serious upgrades to it's hardware, 3 years ago they were pushing 8 megajoule blasts and now, that number has improved somewhat to 33 megajoules accelerating them using magnets (as you do).

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With this power, it can push at speeds of up to Mach 7 for the slug and a current range of 100 miles - with the hope of doubling that by the time these Rail Guns get mounted on decks of battleships by 2025. By that time they won't have such a large power draw and the dangers of exploding shells.