|The .333 Jeffery or .333 Nitro Express, rimmed and rimless versions were developed by W.J. Jeffery & Co and the
rimmed version was introduced in 1908, and the rimless version sometime after that date.
In the mid 1910's the British War Office purchased sporting rifles from British rifle makers in the .333 Jeffery caliber
for used by British snippers against the Germans, also making this a military cartridge.
Both the rimless and rimmed versions are obsolete, accept for a few special runs by a few manufactures.