455⁵

.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" and "Webley .455 revolver".
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.

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