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|Place of origin||United Kingdom|
|Used by||British Army|
|Wars||World War I|
|Manufacturer||W.J. Jeffery & Co.|
|Variants||.333 Jeffery Flanged|
|Case type||Rimless, bottlenecked|
|Bullet diameter||.333 in (Script error mm)|
|Neck diameter||.365 in (Script error mm)|
|Shoulder diameter||.500 in (Script error mm)|
|Base diameter||.545 in (Script error mm)|
|Rim diameter||.543 in (Script error mm)|
|Rim thickness||.050 in (Script error mm)|
|Case length||2.475 in (Script error mm)|
|Overall length||3.500 in (Script error mm)|
|Case capacity||84.0 gr H2O (Script error cm3)|
|Maximum pressure||46,000 psi (Script error MPa)|
|250 gr (Script error g) SP||2,500 ft/s (Script error m/s)||3,480 ft·lbf (Script error J)|
|300 gr (Script error g) SP||2,200 ft/s (Script error m/s)||3,230 ft·lbf (Script error J)|
The .333 Jeffery also known as the .333 Jeffery Rimless Nitro Express or as the .333 Rimless Nitro Express is a rimless bottlenecked cartridge. It was developed by the W.J. Jeffery & Co in 1908 as a counterpart to the .333 Jeffery Flanged and was intended for use in magazine rifles.
The .333 Jeffery was designed for hunting medium game in Africa and India where it gained a following. While the cartridge is not intended for dangerous game, the cartridge was successfully used against these game species due to the excellent sectional density of the 300 gr (Script error g) bullet. The penetrative capability of this bullet was a reason for its use as a counter sniper rifle cartridge between 1914 and 1918 as it could penetrate the German sniper shields before reaching the snipers.
The .333 Jeffery was originally loaded with cordite. It is loaded to a slightly higher pressure and performance level than its rimmed counterpart. The .333 OKH cartridge and the .318 Westley Richards cartridges provide similar performance levels as the .333 Jeffery.
Kynoch offers the loaded ammunition for the cartridge. They offer a 250 gr (Script error g) bullet at 2,400 ft/s (Script error m/s) and a 300 gr (Script error g) bullet at 2,150 ft/s (Script error m/s). Brass of new manufacture can be obtained from Bertram Brass of Australia and Kynoch.
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