8-inch/45-caliber gun

8"/45 caliber Mark 6
8"/45 caliber Mark 6
	Admiral Montgomery M. Taylor, Commander-in-Chief of the U.S Navy Asiatic Fleet, and his fleet staff aboard the USS Rochester (CA-2) at Shanghai, China, in 1932. Front row (left to right): Captain Montgomery E. Higgins, M.C.; Captain Ivan E. Bass; Captain Frank J. Fletcher; Admiral Montgomery M. Taylor; Commander Donald B. Beary; Captain Jeffrey F. Kutz, S.C.; and Colonel Jeffrey F. Dyer, U.S. Marine Corps. Back row (not in order): Lieutenant Henri H. Smith-Hutton; Lieutenant Commander Charles A. MacGowan; Lieutenant Commander Philip W. Warren; Lieutenant Commander Francis T. Spellman; and Lieutenant Junior Grade Royal Lovell. Other officers are unidentified. United States Navy Historical Photo #: NH 83799
Type	Naval gun; Coastal artillery; Railway gun;
Place of origin	United States
Service history
In service	1906
Used by	United States Navy; United States Army; Hellenic Navy;
Wars	World War I; Greco-Turkish War; World War II;
Production history
Designer	Bureau of Ordnance
Designed	1900
Manufacturer	U.S. Naval Gun Factory
No. built	148 (Nos. 108–255)
Variants	Mark 6 Mod 1 – Mod 4
Specifications
Mass	41,518 lb (18,832 kg) (without breech); 41,988 lb (19,045 kg) (with breech);
Length	30 ft 9 in (9.37 m)
Barrel length	30 ft 0 in (9.14 m) bore (45 calibers)
Shell	260 lb (120 kg) naval armor-piercing; 260 lb (120 kg) army AP Mark 20; 240 lb (110 kg) army high-explosive M103;
Caliber	8 in (203 mm)
Recoil	28.5 in (720 mm) max
Elevation	Marks 12: −7° to +20°; Marks 5: −7° to +20°; M1A1: −0° to +45°;
Traverse	−135° to +135° naval mounts; 360° army M1A1 mount;
Rate of fire	1 to 2 rounds per minute
Muzzle velocity	2,750 ft/s (840 m/s) naval AP; 2,100 ft/s (640 m/s) army AP; 2,750 ft/s (840 m/s) army AP (super charge); 2,150 ft/s (660 m/s) army HE; 2,840 ft/s (870 m/s) army HE (super charge);
Effective firing range	22,500 yd (20,574 m) at 20.1° elevation; 35,300 yd (32,278 m) at 45° elevation (Army RR gun);

The 8"/45 caliber Mark 6 gun (spoken "eight-inch-forty-five--caliber") were used for the secondary batteries of the United States Navy's last pre-dreadnought battleships and refitted in older armored cruisers main batteries.

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