"3\"/50 caliber gun"@en . "United States"@en . . . "-15"^^ . . "US Navy"@en . "Peep-site and Optical telescope"@en . . "bore"@en . . "The 3\"/50 caliber gun (spoken \"three-inch-fifty-caliber\") in United States naval gun terminology indicates the gun fired a projectile 3 inches (7.62 cm) in diameter, and the barrel was 50 calibers long (barrel length is 3\" x 50 = 150\" or 3.81 meters). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1890 through the 1990s on a variety of combatant and transport ship classes."@en . "Dual-Purpose Naval Gun"@en . . "The 3\"/50 caliber gun (spoken \"three-inch-fifty-caliber\") in United States naval gun terminology indicates the gun fired a projectile 3 inches (7.62 cm) in diameter, and the barrel was 50 calibers long (barrel length is 3\" x 50 = 150\" or 3.81 meters). Different guns (identified by Mark numbers) of this caliber were used by the U.S. Navy and U.S. Coast Guard from 1890 through the 1990s on a variety of combatant and transport ship classes."@en . . . "20"^^ . "SRF"@en . . . . "3"^^ . . . "\"yes\""@en . . "7"^^ . . "AA, AP, VT Frag , Illumination"@en .