Dr. Hammer’s T250 Vigilante
Basically a scaled-up version of the 20mm Vulcan, this 1950s-era 37mm monster used a half-dozen barrels that all went just past 8-feet in length. The electrically-driven gun’s fodder was the 37x219mmSR round, which was based on a shortened and necked-down 40mm Bofors case.
Its planned rate of fire? Some 3,000 chili-dog-sized shells per minute in 48-round bursts with an eye towards anti-aircraft use, although this could be dialed down to be used against ground targets. Could you imagine 37mm shells raking an enemy pillbox in the latter?