BL 6-inch Mk XIII – XVIII naval gun

By taking on ships being built for foreign navies in British shipyards, a number of British-built 6-inch 50-calibre naval guns found their way into British service in World War I. Their specifications and performance differed from standard Royal Navy 6-inch guns but in British service they fired standard service 100-pound projectiles.

BL 6-inch gun
TypeNaval gun
Place of originUnited Kingdom
Service history
In service1914–1958
WarsWorld War I World War II
Production history
DesignerMk XIII, XVII, XVIII : EOC
Mk XIV, XV, XVI : Vickers
VariantsMk XIII, XIV, XV, XVI, XVII, XVIII
Specifications
Barrel length300 inches (7.620 m) bore (50 cal)

Shell100 pounds (45.36 kg)
Calibre6 inches (152.4 mm)
Muzzle velocityMk XIII : 2,770 feet per second (840 m/s)
Mk XIV & XV : 2,900 feet per second (880 m/s)
Mk XVI : 3,000 feet per second (910 m/s)
Mk XVII : 2,905 feet per second (885 m/s)
Mk XVIII : 2,874 feet per second (876 m/s)
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