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.400 Jeffery Nitro Express
The .400 Jeffery Nitro Express or .450/400 3-inch Nitro Express is a medium bore, bottlenecked, Nitro Express cartridge designed by W.J. Jeffery & Co in 1902, intended for use in single shot and double rifles.
==Development==
The W.J. Jeffery & Co developed the .400 Jeffery NE from the .450/400-3¼ inch Nitro Express, following extraction problems with the latter cartridge.
The .450/400 3¼-inch NE was recreated by loading the old .450/400 3¼-inch Black Powder Express with cordite, transforming a low-velocity deerstalking cartridge into a genuine big-game hunting round capable of tackling even the largest Indian and African game. The conversion was not initially entirely successful, under the increased pressures of the cordite loading the long neck could stick in the chamber causing the rim to pull off at extraction,〔 a problem not encountered with the milder black powder loadings. To counter this, W.J. Jeffery & Co reduced the length of the case to 3-inches and moved the neck further forward, creating this cartridge,〔 as such it was never loaded with black powder.
Unlike earlier .450/400 3¼-inch NE cases the .400 Jeffery NE was standardized on the .411 caliber bullets, renewed interest in the .405 Winchester meant more bullets in this caliber were becoming available.
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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