3,400 feet per second. That's about 2,300 mph, if my figures are accurate, which they probably aren't, even though I did check them twice. But it's still faster than a speeding boat, more powerful than a locomotive (and better suited to use in a marine environment), and able to leap tall buildings with a single shove. Look! Up in the sky! It's a bird! It's a plane! No, it's a high explosive shell from a Mark 110 Mod 0 57mm gun mounted on a Coast Guard cutter!