6.5mm Bergmann

6.5mm Bergmann
Bergmann model 1896 in 6.5 caliber
Type	Pistol
Place of origin	Germany
Production history
Designer	Bergmann
Produced	1895
Specifications
Case type	semi-rimmed
Bullet diameter	.26 in (6.6 mm)
Neck diameter	.285 in (7.2 mm)
Shoulder diameter	.330 in (8.4 mm)
Base diameter	.368 in (9.3 mm)
Rim diameter	.372 in (9.4 mm)
Case length	.870 in (22.1 mm)
Overall length	1.230 in (31.2 mm)
Ballistic performance
Bullet weight/type Velocity Energy 76 gr (5 g) FMJ 710 ft/s (220 m/s) 84 ft·lbf (114 J)
Source(s): "Textbook of Automatic Pistols" [1]

The 6.5mm Bergmann is an unusual centerfire cartridge produced for very early self-loading pocket pistols. The case is bottle-necked and steeply conical, and headspaces on the conical case walls. Early versions 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.^[1]

References

1. ↑ 1.0 1.1
   • Wilson, R. K. Textbook of Automatic Pistols, pp.256-258. Plantersville, SC: Small Arms Technical Publishing Company, 1943.