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Ordnance RML 7 pounder Mk IV Mountain Gun No. 4 (Hazara) Mountain Battery with RML 7 pounder circa. 1895 Type mountain gun Place of origin  United Kingdom Service history In service 1873 - 19? Used by British Empire India Wars Anglo-Zulu War First Boer War Second Boer War Specifications Weight 200 pounds (90.72 kg) barrel Barrel length 36 inches (914 mm) Shell ML, 7lb 11 oz (Shrapnel) 7lb 4oz (Common) 12lb 4oz (Double)[1] Calibre 3 inches (76.2 mm)[1] Traverse nil Muzzle velocity 968 feet per second (295 m/s) Maximum range 3,000 yards (2,700 m)[1] The Ordnance RML 7 pounder Mk IV "Steel Gun" was a rifled muzzle-loading mountain gun primarily used by the Indian Army. 7 pounder referred to the approximate weight of the shell it fired. Contents 1 History 2 Combat Use 2.1 Anglo-Zulu War 1879 2.2 First Boer War 1880-1881 2.3 Second Boer War 1899-1902 3 See also 4 Surviving examples 5 Notes 6 References 7 External links // History Development began in 1864 to replace the RBL 6 pounder 2.5-inch (64 mm) gun of 3cwt, which had proved too heavy for a mountain gun. Several Mks of 7 pounder RML of 2 cwt were tried in 1865 by boring out and rifling old SBML bronze guns, but were still too heavy.[2] Several Mks of new steel barrels (the first British all-steel gun, hence the name "Steel Gun") were then produced of 190 lb (86 kg) and 150 lb (68 kg) but were not considered powerful enough.[2] Mk IV of 200 lb (91 kg) with a longer bore was settled on for production in 1873. It was superseded by the RML 2.5 inch Mountain Gun from 1879. Combat Use It could be assembled and a round loaded in 20 seconds. Its Common shell was considered ineffective. To give it a high angle capability, a Double shell was produced of increased length and containing a larger bursting charge. This was fired with a reduced charge, but the low muzzle velocity did not always arm the fuze, or prevent the over-long projectile from somersaulting. Shell rotation was effected by studs on the body of the shell. Elevation was by quoin or wedge and by screw. [3] Anglo-Zulu War 1879 Britain deployed several guns mounted on Colonial (or "Kaffraria") carriages : light field gun type carriages with larger wider-spaced wheels suited for being horse-drawn across long grass. First Boer War 1880-1881 Britain deployed 4 guns mounted on standard small mountain carriages during the war. Second Boer War 1899-1902 Boers with guns on mountain carriages captured at Kraaipan at the beginning of the war Gun on field carriage at Mafeking The gun was employed mounted on armoured trains and used by local militia forces early in the war. It was also employed mounted on normal Field carriages with larger wheels which increased mobility in the long grass and allowed it to be towed by horses.[3] See also Media related to RML 7 pounder Mountain Gun at Wikimedia Commons Battle of Laing's Nek List of mountain artillery Surviving examples An example from 1885, at Royal Armoury, Fort Nelson, UK Royal Armouries, Fort Nelson, Hampshire, UK Royal Artillery Museum, London South African National Museum of Military History, Johannesburg, South Africa Notes ^ a b c Hall, December 1972 ^ a b Ruffell ^ a b Hall, June 1971 References Major Darrell D Hall, "Guns in South Africa 1899-1902" in The South African Military History Society Military History Journal - Vol 2 No 1, June 1971 Major Darrell D. Hall, "Field Artillery of the British Army 1860-1960. Part I, 1860 - 1900" in The South African Military History Society. Military History Journal - Vol 2 No 4, December 1972 (web page is incorrectly titled 1900-1914) W. L. Ruffell, The Gun - Rifled Ordnance: Mountain Artillery. RML 7 pounder External links Major D.D. Hall, The South African Military History Society Military History Journal Vol 4 No 4, December 1978. "ARTILLERY IN THE ZULU WAR - 1879" Major D.D. Hall, The South African Military History Society Military History Journal - Vol 5 No 2, December 1980. "The Artillery of the First Anglo-Boer War 1880 - 1881" MAJOR G. TYLDEN, ED, The South African Military History Society Military History Journal - Vol 1 No 2, June 1968. Further Notes on Early Rhodesian Military Units and Early Rhodesia's Weapons