|RML 6.3-inch howitzer|
One of the two guns used during the Siege of Ladysmith
|Place of origin||United Kingdom|
|Used by||British Empire|
|Wars||Second Boer War|
|Weight||2,016 lb (914 kg) barrel|
|Barrel length||3 feet 9 inches (1.1 m) bore (7.14 calibres)|
|Shell||70 lb (32 kg)|
|Calibre||6.3 inches (160 mm)|
|Muzzle velocity||751 ft/s (229 m/s)|
|Effective range||4,000 yards (3,700 m)|
The RML 6.3-inch howitzer was a British rifled muzzle-loading "siege" or "position" howitzer/mortar proposed in 1874 and finally introduced in 1878 as a lighter version of the successful 8-inch howitzer that could be carried by the existing 40-pounder gun carriage.
By 1880 the RML 6.3-inch was superseded by a longer 6.6-inch howitzer with higher muzzle velocity.
The barrel consisted of an inner "A" tube of toughened mild steel, surrounded by wrought-iron "B" tube and jacket.
Rifling was of the "polygroove" type, with 20 grooves and a twist increasing from 1 turn in 100 calibres (i.e. 630 inches) to 1 in 35 (i.e. 220 inches).
Second Boer War
A number of RML 6.3-inch howitzers were used by the British forces during the Second Boer War, normally mounted on 40 pr RML carriages.
The gun was the first British rifled muzzle-loader to dispense entirely with studs on shells to impart spin : its shells from the beginning had gas checks attached to their base which expanded and engaged with rifling on firing to impart spin to the shell.
- Two of these guns, called Castor and Pollux, used during the Siege of Ladysmith, stand in front of the Ladysmith town hall. They have been declared Heritage Objects by the South African Heritage Resource Agency. Both the guns and their ammunition were outdated by the time of the siege and they tended to make a lot of smoke when fired.
- Hall, Darrell (1971). "Guns in South Africa 1899-1902 Part V and VI". The South African Military History Society. http://samilitaryhistory.org/vol023dh.html. Retrieved 2008-10-22.
- Text Book of Gunnery 1902, Table XII Page 338.
- 751 ft/second firing 70 lb projectile, using 4 lb RLG2 (gunpowder) propellant. Text Book of Gunnery, 1902, Table XII page 338.
- Treatise on Construction of Ordnance in the British Service, 1879, pages 79; 171; 259-260
- "The Gun - Rifled Ordnance: Howitzers". Royal New Zealand Artillery Association. http://www.riv.co.nz/rnza/hist/gun/rifled7.htm. Retrieved 2009-07-14.
- "9/2/415/0028 - Castor and Pollux 6 3 in. RML Howitzer Ladysmith". South African Heritage Resource Agency. http://22.214.171.124/sahra/HeritageSitesDetail.aspx?id=76656. Retrieved 28 August 2012.
- "Managing Heritage Objects that form part of the National Estate". South African Heritage Resource Agency. 2005-07-15. http://www.sapcon.org.za/docs/conf05-p4.pdf. Retrieved 2008-10-22.
- "Government Gazette Vol. 477". Government of South Africa. 2005-03-30. pp. 5. http://www.info.gov.za/gazette/notices/2005/27424.pdf. Retrieved 2008-10-22. [dead link]
- Nevinson, H. W.. Ladysmith - The Diary of a Siege. METHUEN & CO.. pp. 125. http://www.gutenberg.org/files/16603/16603-h/16603-h.htm. Retrieved 2008-10-22.
- Text Book of Gunnery, 1902. LONDON : PRINTED FOR HIS MAJESTY'S STATIONERY OFFICE, BY HARRISON AND SONS, ST. MARTIN'S LANE
- Treatise on the Construction and Manufacture of Ordnance in the British Service. War Office, UK, 1879
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