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

.333 Jeffery

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...

 and is intended for double rifle

Double rifle

A double-barreled rifle or double rifle is a type of sporting rifle with two barrels instead of one, available in eitherside-by-side or over-and-under barrel configurations. Double rifles are one of the family of combination guns...

s.

General Information

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

Sectional density

Sectional density is the ratio of an object's mass to its cross-sectional area. It conveys how well an object's mass is distributed to overcome resistance. For illustration, a needle can penetrate a target medium with less force than a coin of the same mass...

 of the 300 gr bullet, but is considered inadequate for dangerous game. The performance of the .333 Jeffery Flanged mirrors that of the modern .338-06

.338-06

The .338-06 is a wildcat cartridge based on the .30-06. It allows heavier .338 caliber bullets to be used from the .30-06 non-belted case. This is a better choice for heavy bodied game such as moose, elk, and brown bear than the .30-06...

.

John "Pondoro" Taylor treated the cartridge favorably in his book African Rifles and Cartridges.

The .333 Jeffery Flanged was originally loaded with cordite

Cordite

Cordite is a family of smokeless propellants developed and produced in the United Kingdom from 1889 to replace gunpowder as a military propellant. Like gunpowder, cordite is classified as a low explosive because of its slow burning rates and consequently low brisance...

. It is loaded to slightly lower velocities than its rimless counterpart, the .333 Jeffery. Kynoch

Kynoch

Kynoch was a manufacturer of ammunition, later incorporated into ICI but remaining as a brand name for sporting cartridges.-History:Kynoch was established in Witton in Birmingham in 1862 by Scottish entrepreneur George Kynoch when he opened a percussion cap factory in Witton. In 1895 he built an...

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.