BL 12-inch Mk X naval gun

BL 12-inch gun Mk X
TypeNaval gun
Place of originUnited Kingdom
Service history
In service1906 – 1923
WarsWorld War I
Production history
DesignerVickers
ManufacturerVickers
Unit cost£9800 (1907)[1]
Specifications
Mass57 tons barrel & breech[2]
Barrel length45 feet (13.72 m) bore (45 cal)

Shell850 pounds (385.6 kg) Lyddite, Armour-piercing, Shrapnel[3]
Calibre12 inches (304.8 mm)
BreechWelin interrupted screw
Muzzle velocity2,700 ft/s (823 m/s)[4]
Maximum firing range22,860 m (25,000 yd)[5]

The BL 12 inch Gun Mark X[note 1] was a British 45-calibre naval gun which was mounted as primary armament on battleships and battlecruisers from 1906. It first appeared on HMS Dreadnought.

  1. ^ "H.M.S. "Dreadnought"—Cost of Armaments. (Hansard, 25 March 1907)". Parliamentary Debates (Hansard). 25 March 1907.
  2. ^ "BR 12in 45cal BL Mk X". navalhistory.flixco.info. Retrieved 9 November 2018.
  3. ^ 850 lb shells : Treatise on Ammunition, 1915
  4. ^ 2700 ft/second : As quoted in "Range Tables for His Majesty's Fleet, 1910. February, 1911"; with 260 lb cordite MD size 45 propellant : Treatise on Ammunition, 1915
  5. ^ 22,860 metres quoted at : http://navalhistory.flixco.info/H/76624x53535/8330/a0.htm This is understood to be the maximum possible range at 45° elevation, which was possible for siege mountings on land but not for naval mounts


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