The company has been working for a number of years with the Office of Naval Research on a 200 nautical mile gun system. In a parallel effort, they’ve been developing a smaller, pulse-power technology demonstrator, called the “Blitzer,” for ship defense against anti-ship cruise missiles and small boat swarms.
It's a "short-range" weapon, with just an 80-mile/140 km reach. The projectile exits the "muzzle" at over 10,000 feet per second, or just over 3 km/sec. That's quick. Apparently, the railgun will be capable of 1 round per second, if they can supply enough electrical power, which should not be difficult for Nimitz and Aegis-class vessels. Might be just the thing for dealing with those Iranian Silkworms, as it takes a round less than 7 seconds to reach out to the horizon.
The only other gun that matched this range was "The Paris Gun", from WW1, which took all day to fire 20 rounds.