Dual-purpose guns of the World Wars ĭual-purpose 3"/50 caliber guns (Marks 10, 17, 18, and 20) first entered service in 1915 as a refit to USS Texas (BB-35), and were subsequently mounted on many types of ships as the need for anti-aircraft protection was recognized. These were built-up guns with a tube, partial-length jacket, hoop and vertical sliding breech block. These guns fired the same 2,700-foot-per-second (820 m/s) ammunition used by the following dual-purpose Marks, but with range limited by the maximum elevation of the mounting. Low-angle 3"/50 caliber guns (Marks 3, 5, 6, and 19) were originally mounted on ships built from the early 1900s through the early 1920s and were carried by submarines, auxiliaries, and merchant ships during the Second World War. By World War II these guns were found only on a few Coast Guard cutters and Defensively Equipped Merchant Ships. The gun entered service around 1900 with the Bainbridge-class destroyers, and was also fitted to Connecticut-class battleships. Low-angle (single-purpose/non-anti-aircraft) mountings for this gun had a range of 7000 yards at the maximum elevation of 15 degrees. The US Navy's first 3"/50 caliber gun (Mark 2) was an early model with a projectile velocity of 2,100 feet (640 m) per second. USS Pivot firing its forward 3"/50 caliber gun. The gun is still in use with the Spanish Navy on Serviola-class patrol boats. Coast Guard from 1890 through the 1990s on a variety of combatant and transport ship classes. Different guns (identified by Mark numbers) of this caliber were used by the U.S. The 3"/50 caliber gun (spoken "three-inch fifty-caliber") in United States naval gun terminology indicates the gun fired a projectile 3 inches (76 mm) in diameter, and the barrel was 50 calibers long (barrel length is 3 in × 50 = 150 in or 3.8 m). Mark 22: 45 – 50 rounds per minute with autoloader.Projectile weight: 13 lb (5.9 kg) projectile types: AP, AA (with VT proximity fuze), HE, Illumination
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