BL 6-inch Mk II – VI naval gun

The BL 6-inch gun Marks II, III, IV and VI 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 They were superseded on new warships by the QF 6-inch gun from 1891.

Ordnance BL 6-inch gun Mks II, III, IV, VI
Mk IV gun on disappearing carriage at Lei Yue Mun Fort, Hong Kong
TypeNaval gun
Coast defence gun
Place of originUnited Kingdom
Service history
In service1880 – 1905
Used byRoyal Navy
Production history
DesignerRoyal Gun Factory (RGF)
ManufacturerRGF and EOC
VariantsMks II, III, IV, VI
Specifications
MassMk II : 81 cwt or 89 cwt (4½ tons)
Mks III, IV, VI : 5 tons barrel & breech
Barrel lengthMk III : 153.2 inches (3,891 mm) (25.53 calibres)
Mk IV, VI : 156 inches (3,962 mm) (26 calibres)

Shell100 pounds (45.36 kg)
Calibre6-inch (152.4 mm)
Breech3 motion interrupted screw. De Bange obturation.
Muzzle velocityMk III, IV, VI : 1,960 feet per second (597 m/s)
QFC guns : 1,913 feet per second (583 m/s)
BLC guns : 2,166 feet per second (660 m/s)
Maximum firing range10,000 yards (9,100 m)
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