RML 7-inch gun | |
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![]() 7-inch 6½ ton Mk I gun and crew on HMS Minotaur | |
Type | Naval gun Coast defence gun |
Place of origin | United Kingdom |
Service history | |
Used by | Royal Navy |
Production history | |
Designer | Royal Gun Factory |
Designed | 1865 (7 & 6½ ton) 1874 (90 cwt) |
Manufacturer | Royal Arsenal |
Unit cost | £425[1] |
Variants | 7 ton Mks I – IV 6½ ton Mks I – III 90 cwt |
Specifications | |
Barrel length | 7 ton : 126 inches (3,200 mm) 6½ ton & 90 cwt : 111 inches (2,800 mm)[2] |
Shell | 112 to 115 pounds (51 to 52 kg) Palliser, Common, Shrapnel[3] 160 pounds (73 kg) double common shell |
Calibre | 7-inch (177.8 mm) |
Muzzle velocity | 7 ton : 1,561 feet per second (476 m/s) 6½ ton : 1,525 feet per second (465 m/s) 90 cwt : 1,325 feet per second (404 m/s) |
Maximum firing range | 5,500 yards (5,000 m) |
The RML 7-inch guns were various designs of medium-sized rifled muzzle-loading guns used to arm small to medium-sized British warships in the late 19th century, and some were used ashore for coast defence.