They were top-break or double-action, chambered for the .476 Enfield cartridge which fired a 265 grain lead bullet, loaded with 18 grains of black powder.
Unlike most other top brake self-extracting revolvers, it was somewhat complicated to unload. It had a selective extraction/ejection system which was supposed to allow the user to eject spent cartridges, while retaining live rounds in the cylinder.
It had a hinged frame, and when the barrel was unlatched, the cylinder would move forward, operating the extraction system and allowing the spent cartridges to simply fall out. The idea was that the cylinder moved forward just far enough to permit fired cases to be completely extracted (and ejected by gravity), but not far enough to permit live cartridges from being removed in the same manner.
It required reloading one round at a time via a loading gate, much like the Colt Single Action Army.
Lack of stopping power, the cumbersome loading and a tendency for the action to foul or jam when extracting cartridges made the revolver unpopular and eventually it was replaced in 1889 by the .455 calibre Webley Mk I revolver.
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