BL 7.5 inch Mk VI gun
The BL 7.5-inch gun Mark VI was the 45 calibre naval gun forming the main battery of Royal Navy s. These ships with seven single gun mounts were significant to the cruiser limitations defined by the Washington Naval Treaty.
BL 7.5 inch Mk VI gun
Marshall Bishop H, War Office official photographer · This photograph N 246 comes from the collections of the Imperial War Museums (collection no. 4700-5) · Public domain
- Name
- Ordnance BL 7.5-inch gun Mk VI
- Field
- rifled breech loader · naval artillery
- Region
- United Kingdom of Great Britain and Ireland
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Documentary summary
The BL 7.5-inch gun Mark VI was the 45 calibre naval gun forming the main battery of Royal Navy s. These ships with seven single gun mounts were significant to the cruiser limitations defined by the Washington Naval Treaty.
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In this article
Key facts
Key facts
• Name — Ordnance BL 7.5-inch gun Mk VI • Origin — United Kingdom • Type — Naval gun Coast defence gun • Is Ranged — YES • Is Artillery — YES • Is Uk — YES • Service — 1919–1945 • Used By — Royal Navy • Wars — World War II • Number — 44 • Weight — 14 t • Part Length — 337.5 in; (45 calibres) • Cartridge — 200 lb • Caliber — 7.5 in • Velocity — 2770 ft/s • Max Range — 12 mi
Coast defence guns
Coast defence guns
Seven guns were installed as coastal artillery in the Netherlands Antilles, five in Mozambique, three in Canada, and three in a battery at South Shields during the Second World War.
Shell trajectory
Shell trajectory
• Range — Elevation — Time of flight — Descent — Impact velocity • 5000 yd (4.6 km) — 2° 30′ — 7 sec — 3° 19′ — 1799 ft/s (548 m/s) • 10000 yd (9.1 km) — 7° 3′ — 17 sec — 12° 32′ — 1218 ft/s (371 m/s) • 15000 yd (14 km) — 15° 21′ — 32 sec — 27° 33′ — 1038 ft/s (316 m/s) • 20000 yd (18 km) — 27° 59′ — 51 sec — 44° 35′ — 1071 ft/s (326 m/s)
Description
These were built-up guns with two tubes, full-length wire winding, a jacket, and Welin breech block with hand-operated Asbury mechanism. The mounting was a CP Mk V a hand-operated central pivot mount with additional power training and elevation provided by a 10HP electric motor and hydraulic pump. Elevation was +30 degrees to -5 degrees and loading was possible up to +10 degrees. The total weight of the mount including its 1in open-backed shield was 45.975 tons. They used two cloth bags each containing 14 kg (31 pounds) of cordite to fire a 200-pound (91-kg) projectile up to 19 kilometres at their maximum elevation of 30 degrees. Useful life expectancy was 650 effective full charges (EFC) per barrel.
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The Encyclopedia exists whether or not anything is for sale. Corrections are recorded rather than overwritten, and every version of this record is kept. Published 14 August 2026.
Elsewhere in Militaria
6,095 published records in this field, each with its sources named.
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