| BL 12-inch gun Mk X | |
|---|---|
 | |
| Type | Naval gun |
| Place of origin | United Kingdom |
| Service history | |
| In service | 1906 – 1923 |
| Wars | World War I |
| Production history | |
| Designer | Vickers |
| Manufacturer | Vickers |
| Unit cost | £9800 (1907)[1] |
| Specifications | |
| Mass | 57 tons barrel & breech[2] |
| Barrel length | 45 feet (13.72 m) bore (45 cal) |
| Shell | 850 pounds (385.6 kg) Lyddite, Armour-piercing, Shrapnel[3] |
| Calibre | 12 inches (304.8 mm) |
| Breech | Welin interrupted screw |
| Muzzle velocity | 2,700 ft/s (823 m/s)[4] |
| Maximum firing range | 22,860 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.
- ^ "H.M.S. "Dreadnought"—Cost of Armaments. (Hansard, 25 March 1907)". Parliamentary Debates (Hansard). 25 March 1907.
- ^ "BR 12in 45cal BL Mk X". navalhistory.flixco.info. Retrieved 9 November 2018.
- ^ 850 lb shells : Treatise on Ammunition, 1915
- ^ 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
- ^ 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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