.455 Webley Revolver MK II

Wednesday, August 1st, 2018

The .455 Webley Revolver MK II entered service with the British army in 1897. It was in service with the British army and commonwealth forces until after the end of World War II. The MK I was the predecessor to the MK II and was a black powder cartridge introduced in 1887. There is a series of the .455 that includes the MK III, MK IV, MK V and MK VI and they saw service until 1950 when the 9mm Luger was adapted as part of the NATO standardization. A .455 Automatic was introduced in 1912 and was used by the British army for a short time too.

The .455 MK II is a relatively low velocity round with a relatively mild recoil. In the 1904 Thompson-LaGarde test versus the .45 Colt the .455 Webley MK II was rated superior in stopping power. As a result, the U.S. adapted the .45 ACP a few years later. The MK II through the Automatic, with the exception of the MK VI.Z, used Cordite to propel bullets. The MK VI.Z used nitrocellulose-based propellants. The MK II can propel a .455 dia., 265 grain bullet at 600 fps. with 212 ft.-lbs. of energy. Other manufactures have improved on the ballistics and are able to propel a .455 dia., 262 grain bullet at 845 fps. with 415 ft.-lbs. of energy.

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