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If you watched the video, it was clear that the projectile was going several hundred yards.

Navies around the world have shot conventional shells up to 50 miles away and hit targets for over a century. Both conventional shells and railgun shells obey the same laws of ballistics and the other laws of physics once they leave the gun. Once you get a railgun shell going at the same speed or faster than conventional shells, there's no doubt they will go the distance.