.455 Webley

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.455 Webley
A variety of .455 Webley cartridges
Type	Revolver
Place of origin	United Kingdom
Production history
Manufacturer	Royal Laboratory Woolwich Arsenal, Birmingham Small Arms Company, Eley Brothers, Kynoch Limited, Grenfell & Accles, Kings Norton Metal Company, Dominion Cartridge Company.
Variants	Mk I / Mk II[1]
Specifications
Case type	Straight, rimmed
Bullet diameter	0.454 / 0.454 in (11.5 / 11.5 mm)
Neck diameter	0.473 / 0.476 in (12.0 / 12.1 mm)
Shoulder diameter	na / na
Base diameter	0.478 / 0.480 in (12.1 / 12.2 mm)
Rim diameter	0.530 / 0.535 in (13.5 / 13.6 mm)
Rim thickness	0.039 / 0.045 in (0.99 / 1.14 mm)
Case length	0.886 / 0.770 in (22.5 / 19.6 mm)
Overall length	1.460 / 1.230 in (37.1 / 31.2 mm)
Case capacity	23.23 / 18.30 gr H2O (1.505 / 1.186 cm3)
Primer type	Large pistol (Small pistol in modern Fiocchi loadings)
Maximum pressure	13,000 psi (90 MPa)
Ballistic performance
Bullet mass/type Velocity Energy 265 gr (17 g) FMJ[2] 700 ft/s (210 m/s) 289 ft⋅lbf (392 J) 265 gr (17 g) 600 ft/s (180 m/s) 212 ft⋅lbf (287 J) 265 gr (17 g) 757 ft/s (231 m/s) 337 ft⋅lbf (457 J) 265 gr (17 g) 600 ft/s (180 m/s)[3] 220 ft⋅lbf (300 J) 200 gr (13 g) 900 ft/s (270 m/s) 360 ft⋅lbf (490 J)

.455 Webley is a British handgun cartridge, most commonly used in the Webley top break revolvers Marks I through VI. It is also known as ".455 Eley" and ".455 Colt".

The .455 cartridge was a service revolver cartridge, featuring a rimmed cartridge firing a .455 in (11.5 mm) bullet at the relatively low velocity of 650 ft/s (190 m/s). The result was a cartridge and handgun combination with comparatively mild recoil. The .455 MK III "cupped" cartridge was rated superior to the .45 Colt in stopping power in the disputed United States Thompson-LaGarde Tests of 1904 that resulted in the adoption by the U.S. of the .45 ACP cartridge.

The .455 Webley cartridge remained in service with British and Commonwealth forces until the end of the Second World War.