The .475 Nitro Express is a British rifle cartridge developed in the early 20th century.
[3] Firearms historians remain unclear who developed the .475 Nitro Express,[2] it is likely that a combination of companies going out of business and merging, along with records being lost or destroyed during the London blitz will mean the origins of this cartridge will never be known.
[3] The .475 Nitro Express has never enjoyed the success of any of the cartridges listed above, largely because it was never adopted by any of the major rifle manufacturers.
Due to this, rifles in this calibre have always been rare, generally from lesser known makers such as W.W. Greener, Army & Navy and Manton of Calcutta.
Ballistically it is almost identical to the .450 Nitro Express, with a larger diameter bullet; whether this is an advantage remains in dispute.