BL 6-inch Mk XXII naval gun
|Ordnance BL 6-inch gun Mk XXII|
Gun turrets on HMS Rodney, 1940
|Place of origin||United Kingdom|
|In service||1927 – 1947|
|Used by||United Kingdom|
|Wars||World War II|
|Mass||19,824 lbs. (8,992 kg)|
|Barrel length||300 inches (7.620 m) bore (50 calibres)|
|Shell||1927 : 100 pounds (45 kg)|
1942 : 112 pounds (51 kg)
|Calibre||6-inch (152.4 mm)|
|Breech||364 lbs. (165.1 kg) Welin interrupted screw|
|Recoil||16.5 in (42 cm)|
|Elevation||-5 / +60 degrees|
|Traverse||+100 / -100 degrees|
|Rate of fire||5 rpm|
|Muzzle velocity||898 metres per second (2,950 ft/s)|
They were originally designed as secondary armament for the proposed G3 class battlecruisers. When the G3 class were cancelled after the Washington Naval Treaty the guns and mountings were later used as secondary armament on the two Nelson-class battleships, serving throughout World War II. The Nelsons were the first British battleships since the Lord Nelson class of 1904 to carry their secondary armament in turrets rather than in broadside casemates. The Mk VIII gun mountings could elevate from +60 degrees to -5 degrees, while the telescopic power rammers for the gun loaded at a +5-degree fixed angle. Although classified as a dual-purpose gun and capable of high-angle fire, their training and elevation speeds were too slow for the anti-aircraft role and their main use was against surface targets.
The gun originally fired a 100-pound (45 kg) shell, which had been the standard shell weight for six-inch guns since 1880. From 1942 the gun fired the same 112-pound (51 kg) shell introduced for the later Mk XXIII gun. Figures in the table below are for the 100lb shell.
- MK XXII = Mark 22. Britain used Roman numerals to denote Marks (models) of ordnance until after World War II. This was the twenty-second model of British BL 6-inch gun
- Campbell, Naval Weapons of WWII, p.37.
- Campbell, John (1985). Naval Weapons of World War Two. Naval Institute Press. ISBN 0-87021-459-4.
|Wikimedia Commons has media related to BL 6 inch Mk XXII naval gun.|
- Tony DiGiulian, British 6"/50 (15.2 cm) BL Mark XXII