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.404 Jeffery
The .404 Jeffery is a large-caliber, rimless cartridge〔''Big Bore Rifles and Cartridges'' (1991). Wolfe Publishing Co.:Prescott, Arizona. pg. 235 ISBN 1-879356-00-7〕 designed for large, dangerous game, such as the "Big Five" (elephant, rhino, cape buffalo, lion and leopard) of Africa. Other names for this cartridge include .404 Jeffery Rimless, .404 Rimless Nitro Express, and 10.75× 73mm. It was created by W.J. Jeffery & Co of England based on their desire to duplicate performance of the .450/400 (3¼") cartridge.〔(The .404 Jeffery by Chuck Hawks )〕 There are two basically similar sets of dimensions for this case, depending on the manufacturer. The .404 Jeffery as originally loaded fired a .423" diameter bullet of either with a muzzle velocity of and muzzle energy of or with a muzzle velocity of and of energy.〔Taylor, John (Reprint edition 1977). ''African Rifles and Cartridges''. The Gun Room Press:Highland Park, New Jersey. pg. 107 ISBN 0-88227-013-3〕 It is very effective on large game and is favored by many hunters of dangerous game. Performance and recoil are similar to other African dangerous game cartridges.The .404 Jeffery was popular with hunters and game wardens in Africa because it gave good performance with a manageable level of recoil. By way of comparison, the .416 Rigby and .416 Remington Magnum both fire a 400 grain .416 in bullet at with a muzzle energy of approximately , which handily exceeds the ballistic performance of the .404 Jeffery but at the price of greater recoil and, in the case of the .416 Rigby, rifles that are significantly more expensive.
==History==
Originally the .404 Jeffery was very popular with hunters in Africa and saw significant use in both British and German colonies. As the British Empire began to shrink, many of the popular British big-bore cartridges also dwindled in popularity, and the .404 Jeffery was one of them. By the 1960s it had all but disappeared from common firearm usage.〔(The .404 Jeffery by Chuck Hawks (subscription required) )〕 This condition was mostly the result of the closing of the British Ammunition giant Kynoch, which was the primary manufacturer of the .404 Jeffery and many other British cartridges. The introduction of the .458 Winchester Magnum in 1956 in the Winchester Model 70 bolt action rifle provided an affordable alternative to the big Nitro Express rifles and cartridges and helped to hasten the demise of the .404 Jeffery. Winchester also started a marketing campaign at about this time called "Winchester in Africa" with much success. Renewed interest in heavy game rifles and political stability in Africa has led to a resurgence in African hunting and the rifles suited for it. Kynoch Ammunition has reopened as Kynamco Limited (Kynoch Ammunition ). Hornady, RWS and Norma of Sweden are also offering .404 Jeffery ammunition.
A more recent development by Norma of Sweden has been the introduction of 450gr ammunition under their African PH banner. The increase in projectile weight and increase in Sectional Density turns the ballistics of the 404 Jeffery into something to behold. Fired at 2150fps the cartridge now outperforms most of its peers with a still relatively mild recoil due to the efficient design of the cartridge. The ability to do this out of a standard length Mauser action makes it the top contender as the greatest large bore cartridge in existence today. Heavy for caliber components are available from Woodleigh, North Fork Technologies as well as Claw and Dzombo bullets both from South Africa.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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