Source(s): Cartridges of the World - 8th Edition (1997), Frank C. Barnes, page 245
Also known as the .320 European or .320 Bulldog, this revolver cartridge was designed for the Webley Bull Dog pocket revolver in the 1870s. The .32 Short Colt was based on the .320 but had a different sized rim. On some guns the Short Colt will actually fit and cycle properly. However, modern .32 Colt ammunition should never be used in a black-powder firearm. Reloading using reliable published data and a black-powder substitute like Pyrodex can be safe and successful.