5mm Bergmann

The 5mm Bergmann is an unusual centerfire cartridge produced for very early self-loading pocket pistols. The case is steeply conical and headspaces on the conical case walls. Early versions (sometimes called the 5 mm Bergmann Rimless) were made without any rim or extraction groove; and relied upon blow-back for expulsion of the fired case from the chamber. Later Bergmann pistols provided an extractor requiring a groove which produced a semi-rimmed case. The long bullet was inadequately stabilized and tended to tumble in flight.[1]

5mm Bergmann
TypePistol
Place of originGerman Empire
Production history
DesignerBergmann
Produced1895
Specifications
Bullet diameter.2 in (5.1 mm)
Ballistic performance
Bullet mass/type Velocity Energy
35 gr (2 g) FMJ 580 ft/s (180 m/s) 26 ft⋅lbf (35 J)
Source(s): "Textbook of Automatic Pistols" [1]

References
    • Wilson, R. K. Textbook of Automatic Pistols, pp.259-260. Plantersville, SC: Small Arms Technical Publishing Company, 1943.
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