|.333 Jeffery Flanged|
|Place of origin||United Kingdom|
|Designer||W.J. Jeffery & Co.|
|Case type||Rimmed, bottlenecked|
|Bullet diameter||.333 in (Script error mm)|
|Neck diameter||.356 in (Script error mm)|
|Shoulder diameter||.484 in (Script error mm)|
|Base diameter||.544 in (Script error mm)|
|Rim diameter||.625 in (Script error mm)|
|Case length||2.50 in (Script error mm)|
|Overall length||3.49 in (Script error mm)|
|Primer type||large rifle|
|250 gr (Script error g) SP||2,400 ft/s (Script error m/s)||3,200 ft·lbf (Script error J)|
|300 gr (Script error g) SP||2,150 ft/s (Script error m/s)||3,090 ft·lbf (Script error J)|
| Test barrel length: 28 inches|
The .333 Jeffery Flanged or .333 Flanged Nitro Express is a .333 caliber rimmed, bottlenecked rifle cartridge. It was developed by the W.J. Jeffery & Co. in 1908 as a rimmed version of the .333 Jeffery and is intended for double rifles.
The .333 Jeffery Flanged was designed for hunting medium game in India and Africa where it was quite popular. It has been used successfully against elephants due to the excellent sectional density of the 300-grain (Script error g) bullet, but is considered inadequate for dangerous game. The performance of the .333 Jeffery Flanged mirrors that of the modern .338-06.
The .333 Jeffery Flanged was originally loaded with cordite. It is loaded to slightly lower velocities than its rimless counterpart, the .333 Jeffery. Kynoch currently loads ammunition for this cartridge. The .318 Westley Richards was a close contemporary of the .333 Jeffery Flanged.
Bertramm Brass of Australia and Kynoch (by Kynamco) manufacture virgin brass. Factory ammunition is provided by Kynoch.
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