3″/50 caliber gun
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The 3-inch/50-caliber gun in United States naval gun terminology indicates the gun fired a projectile 3 inches in diameter, and the barrel was 50 calibers long. Different guns of this caliber were used by the U.S. Navy and U.S. Coast Guard from... Wikipedia
Caliber: 3-inch (76 mm)
Length: Mark 2: 153.8 inches (3.91 m); Mark 21: 159.7 inches (4.06 m)
Elevation: Pedestal Mount: -10° to +15°; AA Mount: -10° to +85°
Maximum firing range: 14,600 yd (13,400 m) at 43° elevation; 30,400 ft (9,300 m) AA ceiling
Muzzle velocity: 2,700 ft/s (820 m/s)
Rate of fire: : Mark 2: 15 – 20 rounds per minute; Mark 22: 45 – 50 rounds per minute with autoloader;
Used by: US Navy
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