.320 Revolver

.320 Revolver
Type	Revolver
Place of origin	United Kingdom
Production history
Produced	1870s
Specifications
Bullet diameter	.3170 in (8.05 mm)
Neck diameter	.3200 in (8.13 mm)
Base diameter	.3220 in (8.18 mm)
Rim diameter	.3500 in (8.89 mm)
Case length	.6200 in (15.75 mm)
Overall length	.9000 in (22.86 mm)
Rifling twist	1 turn in 22 in (560 mm)
Primer type	Berdan
Ballistic performance
Bullet weight/type Velocity Energy 80 gr (5 g) Lead 168 m/s (550 ft/s) 73 J (54 ft·lbf)
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.