7.63×25mm Mauser
Type	Pistol
Place of origin	German Empire
Service history
Used by	Germany,Soviet Union,China,Spain andFinland
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)
Land diameter	7.62 mm (0.300 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)

The7.63×25mm Mauser (.30 Mauser Automatic) round is a bottleneck,rimless,centerfire cartridge, originally developed for theMauser C96 service pistol. This cartridgeheadspaces on the shoulder of the case.^[1] It later served as the basis for the7.62mm Tokarev cartridge commonly used in Soviet andEastern Bloc weapons.

This cartridge was based on the7.65mm Borchardt of 1893, the most successful semi-automatic pistol cartridge in production at the time, due to its use in theBorchardt C-93 pistol. The 7.63mm Mauser is sometimes confused with the later7.65mm 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 pistol for which it was designed, theMauser C96 in all variants and copies, theAstra Model 900 and variants, theSchwarzlose Model 1898, the 1911-patternStar models A and M,^[2] and a handful of pre-World War II submachine guns such as the SwissBergmann M/20 exported toChina andJapan^[3] andSIG's uniqueMKMO.

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 the7.62mm Tokarev as officially adopted by theSoviet 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 inMauser C96 pistols or other firearms chambered for 7.63mm Mauser. However, the slightly less powerful 7.63mm Mauser could be used safely in firearms chambered for the more powerful 7.62mm Tokarev.^[4] This became important later during World War II on the Eastern Front when the Germans began using captured 7.62×25mm weapons, notably thePPSh-41 andPPS, and fed them with 7.63mm Mauser rounds.^[5] During the Finnish-SovietWinter 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 fromFN for this purpose.^[6]

Some 7.63mm Mauser ammunition is still manufactured byFiocchi,Sellier & Bellot, andPrvi Partizan. Reloadable boxer-primed cartridge cases can be formed from9mm Winchester Magnum by simply resizing and trimming. Alternatively, they can be formed from 5.56mm NATO with the additional step of inside neck-reaming. These cases bulge slightly on firing, and proper Mauser stripper clips are squeezed in a vise to secure an adequate grip on the smaller rims. For the Mauser, the use of .311" or .312" bullets produce the best accuracy - the Hornady 85 grain .312^[7]" XTP being a particularly good choice, but Tokarev TT-33 and Czech CZ-52 pistols have tighter barrels and chambers and function better with .310" bullets of the sort intended for the 7.65mm Luger and.30 Carbine rounds.

• .30 Mauser Pistol
• .30 Bore -Pakistan Ordnance Factory (used for both the 7.63mm Mauser and 7.62mm Tokarev cartridges).

• 7 mm caliber
• Table of handgun and rifle cartridges

• Barnes, Frank C.CARTRIDGES OF THE WORLD 3rd Edition pgs 152–177, 1972 Digest Books,ISBN 0-695-80326-3
• والي، صلاح. (2009).السلام عليكم : رواية. al-Ḥaḍārah lil-Nashr.ISBN 978-977-476-007-5.OCLC 373100208.

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