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Experiments to date have been with projectiles that are not only not guided, but not even explosive - hence, "bricks". Although the projectile experiences less maximum acceleration than 1 fired from an ordinary gun, it also goes through the intense electromagnetic field. So the projectiles may not be able to contain electronic fuses & guidance mechanisms.
The Navy is urgently in need of weapons to counter modern cruise missiles, which fly at high speeds - some supersonic - and at low altitudes (aka sea skimming), therefore leaving only seconds between appearing on radar & hitting a ship.