5-inch/54-caliber Mark 42 gun
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The Mark 42 5"/54 caliber gun is a naval gun mount used by the United States Navy and other countries. It consisted of the Mark 18 gun and Mark 42 gun mount. Wikipedia
Barrel length: 6.858 m (270.0 in); Rifling: 5.82 m (229 in)
Caliber: 5 inches (127.0 mm)
Elevation: • -15°/+85°; Maximum elevation rate: 25°/sec
Mass: 60.4 long tons (61.4 t)
Maximum firing range: • 25,909 yd (23,691.2 m) at +45° elevation; • 51,600 ft (15,727.7 m) at +85° elevation
Muzzle velocity: 2,650 ft/s (807.7 m/s)
Rate of fire: As built/designed: 40 rounds per minute automatic; Down-rated to 28 rounds per minute in 1968