BL 6-inch Mk II – VI naval gun
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The BL 6-inch gun Marks II, III, IV and VI[note 1] were the second and subsequent generations of British 6-inch rifled breechloading naval guns, designed by the Royal Gun Factory in the 1880s following the first 6-inch breechloader, the relatively unsuccessful BL 6-inch 80-pounder gun designed by Elswick Ordnance. They were originally designed to use the old gunpowder propellants but from the mid-1890s onwards were adapted to use the new cordite propellant. They were superseded on new warships by the QF 6-inch gun from 1891.
Quick Facts Ordnance BL 6-inch gun Mks II, III, IV, VI, Type ...
Ordnance BL 6-inch gun Mks II, III, IV, VI | |
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Type | Naval gun Coast defence gun |
Place of origin | United Kingdom |
Service history | |
In service | 1880 – 1905 |
Used by | Royal Navy |
Production history | |
Designer | Royal Gun Factory (RGF) |
Manufacturer | RGF and EOC |
Variants | Mks II, III, IV, VI |
Specifications | |
Mass | Mk II : 81 cwt or 89 cwt (4½ tons)[1] Mks III, IV, VI : 5 tons barrel & breech[2] |
Barrel length | Mk III : 153.2 inches (3,891 mm) (25.53 calibres) Mk IV, VI : 156 inches (3,962 mm) (26 calibres)[3] |
Shell | 100 pounds (45.36 kg)[3] |
Calibre | 6-inch (152.4 mm) |
Breech | 3 motion interrupted screw. De Bange obturation. |
Muzzle velocity | Mk III, IV, VI : 1,960 feet per second (597 m/s)[4] QFC guns : 1,913 feet per second (583 m/s)[5] BLC guns : 2,166 feet per second (660 m/s)[6] |
Maximum firing range | 10,000 yards (9,100 m)[7] |
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