BL 7.5-inch Mk I naval gun

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Ordnance BL 7.5 inch gun Mk I
HMS Antrim Starboard 7.5 inch wing gun.jpg
Starboard wing gun on HMS Antrim
Type Naval gun
Place of origin United Kingdom
Service history
In service 1905–20
Used by Royal Navy
Wars World War I
Production history
Designer Vickers
Designed circa. 1901
Manufacturer Vickers
Produced 1905
No. built 33
Weight 13.7 long tons (13.9 t)
Barrel length 28 feet (8.534 m) bore (45 calibres)

Shell 200 pounds (90.7 kg)
Calibre 7.5 inches (191 mm)
Breech Welin breech block
Elevation -5° to +15°
Rate of fire 4-5 rpm
Muzzle velocity 2,700 ft/s (820 m/s)[1]
Effective firing range 7.9 mi (12.7 km) at 15°[2]

The BL 7.5-inch gun Mk I was a British 45-calibre, medium-velocity, naval gun which entered service with the Royal Navy in 1905.


This gun was only mounted on Devonshire class cruisers commissioned in 1905, and was quickly superseded by the 50-calibre 7.5 inch Mk II gun.

See also[edit]


  1. ^ 2700 ft/sec firing a 200-pound projectile: Brasseys Naval Annual 1902 using 61 lb cordite MD size 26 propellant : Treatise on Ammunition 1915
  2. ^ Friedman, Norman (2011-01-01). Naval weapons of World War One. Seaforth. ISBN 9781848321007. OCLC 786178793. 


  • Friedman, Norman (2011). Naval Weapons of World War One. Barnsley, South Yorkshire, UK: Seaforth. ISBN 978-1-84832-100-7. 

External links[edit]