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6"/47 (15.2 cm) Mark 16

Three forward turrets and empty cartridge cases on USS Brooklyn (CL-40) after she had bombarded Licata, Sicily, during the early hours of the Allied invasion, 10 July 1943

Type Naval gun
Place of origin United States
Service history
In service 1937 - 1979
Used by United States Navy
Wars World War II
Korean War
Vietnam war
Weight Brooklyn and St. Louis classes: 154 to 167 tons (156 to 170 mt)
Cleveland and Fargo classes: 165 to 173 tons (168 to 176 mt)
Length 282.3 in (7.169 m)
Crew 3 officers and 52 enlisted men

Shell AP Mark 35 Mods 1 to 11 (super heavy) - 130 lbs. (59.0 kg)
HC Mark 34 Mods 1 to 7 - 105 lbs. (47.6 kg)
Caliber 6 inches (15.2 cm)
Recoil 21 in (53 cm)
Elevation -5 / +40 degrees as designed, later modified to +60 degrees
Rate of fire 8 - 10 rounds per minute
Muzzle velocity 2,665 fps (812 mps)
Maximum range 26,118 yards (23,881 m) at 47.5 degrees elevation

The Mark 16/1 triple 6-inch /47 gun turret (3x152 mm) was a feature of many U.S. cruisers during World War II. The Cleveland-class cruiser from that period had four such turrets.

Three 6 inch /47 Mark 16 guns were mounted as a triple turret

Today one of the few triple gun turrets left in the world is on the museum ship USS Little Rock (CG-4), which is located in the Buffalo and Erie County Naval & Military Park in Buffalo, New York.

6 inch /47 guns

Each gun could fire a 130-pound (59 kg) projectile 13 miles (21 km). Maximum range at 41 degrees elevation was 14.5 miles (23.3 km). Projectiles varied in weight; armor-piercing projectile weighed 130 pounds, a high capacity projectile weighed 105 pounds, and an anti-aircraft projectile weighed 65 pounds. Ammunition was semi-fixed (the projectile and the powder casing were separate). The powder case for these guns was housed in a brass canister and weighed 65 lb (29 kg).

Eight to ten rounds per minute could be fired from each of the 6-inch guns.[1] Each gun weighed 4.31 tons and could be elevated up to 60 degrees. Originally gun ports in the turret faces were cut to allow only 41 degrees elevation, though during World War Two all triple 6 inch/47 gun ports were ordered to be modified to permit the full 60 degrees. The guns could not be loaded at greater than 20 degrees elevation; this reduced the rate of fire when engaging distant surface targets or aircraft. All three guns in each turret were mounted in the same sleeve, but delay coils permitted "split salvos" to be fired; this cured a shell pattern dispersion problem common to many US cruisers of the 1920s and 1930s. The 105 pound armor piercing shell fired at 2810 feet per second could pierce up to 5 in (127 mm) of hardened armor plate out to 9,200 yards; the 130 pound AP shell introduced just before World War Two fired at 2500 feet per second could penetrate out to 15,700 yards.

Gun barrel lives were 750 to 1050 full charge rounds.


A 6-inch triple turret weighed in at about 70 tons, and each rifle barrel was 23 feet 6 inches (7.16 m) long. The turret rested on a barbette or circular shaft that extended several decks into the ship. Projectiles were stored in a projectile handling room in the lower part of the barbette. Over 900 projectiles could be stored in the projectile handling room. The guns were supplied with projectiles via hoists.

Powder stores were below the projectile handling room and powder hoists fed the guns. Empty powder canisters were ejected from the turret via an ejector port at the back of the turret. When the guns were firing, it was not unusual to see empty brass canisters piling up on the deck behind the turret. The turret itself had 6.5 inches (170 mm) of armor plate on its face and could train (turn) to follow its target at ten degrees a second.

Each turret required a crew of 3 officers and 52 enlisted men.[1]


As well as ships of the Cleveland class, these turrets were also fitted to the Brooklyn, St. Louis, and Fargo class cruisers.[1]


  1. 1.0 1.1 1.2 "USA 6'/47 (15.2 cm) Mark 16". 2011. Retrieved 2 January 2012. 
This article includes text from public information on display on the Museum ship USS Little Rock (CG-4), which is located in the Buffalo and Erie County Naval & Military Park in Buffalo, New York.

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