.476 Enfield

The .476 Enfield, also known as the .476 Eley, .476 Revolver, and occasionally .455/476, was a Britishcentrefire black powder revolver cartridge. Used in the Enfield Mk II revolver, the Mk III variant was introduced by the British Army in 1881, supplanting the earlier .476 Enfield Mark I and II cartridges, which in turn had replaced the .450 Adams cartridges, all of which also used black powder propellant. The .476 Enfield cartridge was only in British service for a comparatively short period before it was replaced by the black powder-loaded .455 Webley Mark I in 1887 and then by the smokeless powder-loaded .455 Webley Mark IV in September 1894. Just over 1,000 Enfield Mark IIs were issued to the North-West Mounted Police, and these remained in service until 1911, when the last Enfields were phased out in favour of more modern (and reliable) .45 Colt New Service revolvers.

Using the same bullet as the .455 (11.6mm) Webley Mark I, the .476 casing was 0.05 mm (0.002 in) longer and carried a charge of 18 gr (1.17 g) of black powder, compared to 6.5 gr (0.42 g) of cordite in the .455 Mark I. While the .476 Enfield cartridge could be used in any British-manufactured .455 Webley calibre service revolver, there were issues with the later-production Colt or Smith & Wesson .455 Revolver models, which were liable to have slightly smaller bore diameters.