BL 12-inch Mk III – VII naval gun

Ordnance BL 12 inch gun Mk III – VIIte
Ordnance B.L. 12 inch (Mark V)
TypeNaval gun
Coastal gun
Place of originUnited Kingdom
Service history
In service1886?–1920
Used byRoyal Navy
Production history
Designed1882
VariantsMks III - VII
Specifications
Mass
  • Mk III 44 tons
  • Mk IV 45 tons
  • MK V 45 tons
  • Mk VI, VII : 46 tons
Length27 feet 4.5 inches (8.344 m) (L/27)
Barrel length
  • Mk III - VII 303 inches (7.696 m) bore (L/25.25)
Calibre12-inch (304.8 mm)
Muzzle velocity
  • 1,910 feet per second (582 m/s) 714 lb projectile, with 295 lb Brown Prismatic powder
  • 1,914 feet per second (583 m/s) with 295 lb brown powder or 88 lb 8 oz cordite size 30 charge.
Effective firing range
  • MK III / IV: 8,000 yards (7,300 m) at 9° 57'

The BL 12 inch naval gun Mk III–VII were a series of all-steel British rifled breech-loading naval gun models of the mid-1880s intended for the largest warships such as battleships and also for coastal defence.

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