6-inch/50-caliber gun

6"/50 caliber Mark 6 and Mark 8
6"/50 caliber Mark 6 and Mark 8
	USS Ohio (BB-12), 6-inch/50 caliber guns.
Type	Naval gun; Coastal defence;
Place of origin	United States
Service history
In service	1903
Used by	United States Navy
Wars	World War I; World War II;
Production history
Designer	Bureau of Ordnance
Designed	1898
Manufacturer	U.S. Naval Gun Factory; Midvale Steel;
Produced	1900–1917
No. built	Mark 6: 136 (Nos. 197, 210–259, 277–359, 421–422); Mark 8: 215 (Nos. 360–420, 427–510, 525–594);
Variants	Mark 6 and Mark 8
Specifications
Mass	18,112 lb (8,215 kg) (without breech); 18,628 lb (8,450 kg) (with breech);
Length	300.2 in (7,630 mm)
Barrel length	294 in (7,500 mm) bore (49 calibers)
Shell	105 lb (48 kg) naval armor-piercing
Caliber	6 in (152 mm)
Elevation	−10° to +15°
Traverse	−100° to +100°
Rate of fire	6 rounds per minute
Muzzle velocity	2,800 ft/s (850 m/s)
Effective firing range	15,000 yd (14,000 m) at 14.9° elevation WWI charge; 16,000 yd (15,000 m) at 15° elevation WWII charge;

The 6"/50 caliber gun Mark 6 and Mark 8 (spoken "six-inch-fifty-caliber") were used for the secondary batteries of the United States Navy's Maine-class and Virginia-class battleships, as well as the Pennsylvania-class and Tennessee-class armored cruisers. They were also used as the main battery on the St. Louis-class protected cruisers.

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