9mm Browning Long

9×20mm Browning Long
Type	Semi-automatic pistol
Place of origin	Belgium
Production history
Designer	John Moses Browning
Designed	1903
Manufacturer	Fabrique Nationale de Herstal
Specifications
Case type	semi-rimmed, straight
Bullet diameter	.3578 max. (9.09mm max.)
Neck diameter	.379" nom. (9.68mm max.)
Base diameter	.380" nom. (9.72mm max.)
Rim diameter	.404 in (10.3 mm)
Case length	20 mm (0.79 in)
Overall length	1.10 in (28 mm)
Primer type	Small pistol
Ballistic performance
Bullet mass/type Velocity Energy 110 gr (7 g) FMJ 1,000 ft/s (300 m/s) 240 ft·lbf (330 J)
Source(s): Rifles and Machine Guns

The 9×20mm Browning Long is a military centerfire pistol cartridge developed in 1903 for the FN Model 1903 adopted by Belgium, France, the Netherlands, and Sweden.

9mm Browning Long is similar to the 9×19mm Parabellum, but has a slightly longer casing and is semi-rimmed, so the cartridge headspaces on the rim. 9×19mm also uses a heavier bullet and is more powerful. Ammunition was produced in Belgium, France, England, Sweden and the United States. There was some production in Germany during World War I for the Ottoman Empire, and the cartridge was also used in South Africa.

The cartridge is now obsolete and it is hard to find reloadable brass for this ammunition; one option handloaders have is to take the .38 Super and shorten it to the right length.

As of 2016-04 Prvi Partizan in Serbia still manufactures 9mm Browning Long ammunition. The Prvi bullet weighs 7 grams (108 gr.), the diameter is listed @ 0.3585" and the velocity is listed @ 350 m/s (1148 fps). CIP lists bullet maximum @ 9.09mm (0.3578"). CIP barrel dimensions are 0.351" for minimum bore diameter, and 0.359" for minimum groove diameter.

There is reloading data available on a few websites and in some handloading manuals, e.g. the Norwegian Ladeboken. Ladeboken:

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Wikipedia