3-inch/23-caliber gun

Mark 9: 749 pounds (340 &nbsp; kg) (with breech)
Mark 13: 531 pounds (241 &nbsp; kg)
Mark 14 Mod 0: 593 pounds (269 &nbsp; kg) (with breech)
Mark 14 Mod 1: 658 pounds (298 &nbsp; kg) (with breech)

3"/23 caliber gun
3"/23 caliber gun
	A 3"/23-caliber gun being fired aboard the United States Navy submarine chaser USS SC-291 sometime between 1918 and 1920.
Type	Naval gun; Anti-aircraft gun;
Place of origin	United States
Service history
In service	1913—1946
Used by	US Navy
Wars	World War I; World War II
Production history
Manufacturer	Bethlehem Steel (Mark 11); Driggs-Schroeder (Mark 13); Poole Engineering and Machine Company (Mark 14);
Variants	Mark 9, 13, and 14
Specifications
Mass	Mark 9: 749 pounds (340 kg) (with breech); Mark 13: 531 pounds (241 kg); Mark 14 Mod 0: 593 pounds (269 kg) (with breech); Mark 14 Mod 1: 658 pounds (298 kg) (with breech);
Length	Mark 9: 77.05 inches (1.957 m); Mark 14: 79 inches (2.0 m);
Barrel length	Mark 9: 69 inches (1.8 m) bore (23 calibres); Mark 14: 71 inches (1.8 m) bore (23.5 calibres);
Shell	16.5 lb (7.5 kg) 76.2x234 mm R
Caliber	3-inch (76 mm)
Elevation	-15° to +65° or +75°
Traverse	365°
Rate of fire	8 – 9 rounds per minute
Muzzle velocity	1,650 feet per second (500 m/s)
Effective firing range	8,800 yards (8,000 m) at 45.3° elevation (WW I); 10,100 yards (9,200 m) at 45° elevation (WW II); 18,000 feet (5,500 m) at 75° elevation (AA);

The 3"/23 caliber gun (spoken "three-inch-twenty-three-caliber") was the standard anti-aircraft gun for United States destroyers through World War I and the 1920s. United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 23 calibers long (barrel length is 3" x 23 = 69" or 1.75 meters.)

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