Paixhans gun
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The Paixhans gun was the first naval gun designed to fire explosive shells. It was developed by the French general Henri-Joseph Paixhans in 1822–1823. The design furthered the evolution of naval artillery into the modern age. Wikipedia
Shell: 30 kg (66 lb) shell
Designed: 1823
Caliber: 220 mm (8.7 in)
Mass: 3,400 kg (7,500 lb)
Muzzle velocity: 400 m/s (1,300 ft/s)
Used by: France, the United States, Russia