Rahul Sharma (Editor)

.320 Revolver

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Type  Revolver
Produced  1870s
Neck diameter  .3200 in (8.13 mm)
Place of origin  United Kingdom
Bullet diameter  .3170 in (8.05 mm)
Base diameter  .3220 in (8.18 mm)

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.

References

.320 Revolver Wikipedia