|Place of origin||United Kingdom|
|Case type||Rimmed, straight|
|Bullet diameter||.224 in (5.7 mm)|
|Neck diameter||.238 in (6.0 mm)|
|Base diameter||.239 in (6.1 mm)|
|Rim diameter||.279 in (7.1 mm)|
|Rim thickness||.043 in (1.1 mm)|
|Case length||.742 in (18.8 mm)|
|Overall length||.939 in (23.9 mm)|
|Source(s): The Encyclopædia of Sport & Games.|
The .220 Rook is a rimmed cartridge originally designed for use in rook rifles, it was designed and produced in Britain in the 1880s. It is believed to be an early centrefire version of the .22 Long Rifle rimfire cartridge.
The .220 Rook fired a bullet of 30 grains (1.9 g) weight driven by 5 grains (0.32 g) of black powder, it was designed for hunting small game and target shooting, although many considered it too small for practical hunting purposes.
- Henry Charles Howard Earl of Suffolk and Berkshire, Hedley Peek and Frederick George Aflalo (eds), The Encyclopædia of Sport & Games, Volume 1, William Heinemann, London, 1911.
- Bulletblog, ".220 Rook", bullet-blog.com, retrieved 21 April 2017.
- Cartridgecollector, "220 Rook (220 Long Centrefire)", cartridgecollector.net, retrieved 21 April 2017.
- William Wellington Greener, The breech-loader and how to use it, Cassell & Co, London, 1892.
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