7.63mm Mauser

7.63×25mm Mauser
Type	Pistol
Place of origin	German Empire
Service history
Used by	Germany, Soviet Union, China, Spain and Finland
Production history
Designer	Deutsche Waffen und Munitionsfabriken
Designed	1896
Specifications
Parent case	7.65×25mm Borchardt
Case type	Rimless, bottleneck
Bullet diameter	7.86 mm (0.309 in)
Neck diameter	8.46 mm (0.333 in)
Shoulder diameter	9.60 mm (0.378 in)
Base diameter	9.86 mm (0.388 in)
Rim diameter	9.98 mm (0.393 in)
Case length	25.15 mm (0.990 in)
Overall length	34.80 mm (1.370 in)
Ballistic performance
Bullet mass/type Velocity Energy 5.6 g (86 gr) FMJ 441 m/s (1,450 ft/s) 545 J (402 ft·lbf)

The 7.63×25mm Mauser (.30 Mauser Automatic) round was the original cartridge for the Mauser C96 service pistol. This cartridge headspaces on the shoulder of the case. It later served as the basis for the 7.62mm Tokarev cartridge commonly used in Soviet and Eastern Bloc weapons.

This cartridge was based on the 7.65mm Borchardt of 1893, the most successful semi-automatic pistol cartridge in production at the time, due to its use in the Borchardt C-93 pistol. The 7.63mm Mauser is sometimes confused with the later 7.65mm Parabellum (.30 Parabellum), also a bottlenecked pistol cartridge used in the Luger Parabellum. It has been manufactured from the 1890s until the present by various ammunition manufacturers.

Firearms chambered for the 7.63mm Mauser cartridge include the C96 and variants and copies, the Astra Model 900 and variants, the Schwarzlose Model 1898, the 1911-pattern Star models A and M, and a handful of pre-World War II submachine guns such as the Swiss Bergmann M/20 exported to China and Japan and the SIG MKMO.

Several Soviet pistol and submachine gun developments of the late 1920s were designed to use the 7.63mm Mauser cartridge. The Mauser cartridge thus became the basis for the 7.62mm Tokarev as officially adopted by the Soviet Union. Although the case dimensions of the two cartridges are nearly identical, the 7.62mm Tokarev has a stronger powder charge and is generally not suited for use in Mauser C96 pistols or other firearms chambered for 7.63mm Mauser. However, the 7.63mm Mauser could be used in firearms chambered for the 7.62mm Tokarev: something that became important later during World War II on the Eastern Front when the Germans began using captured 7.62×25mm weapons, notably the PPSh-41 and PPS, and fed them with 7.63mm Mauser rounds. During the Finnish-Soviet Winter War and World War II, the cartridge was issued by Finnish and German forces for use in captured Soviet submachine guns, due to its inherent substitutability for the Soviet 7.62×25mm round. According to Finnish military archives, the Finnish Army ordered one million rounds of 7.63mm Mauser from FN for this purpose.

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Wikipedia