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
Case type semi-rimmed, straight
Bullet diameter .3578 max. (9.09mm max.[1])
Neck diameter .379" nom. (9.68mm max.[1])
Base diameter .380" nom. (9.72mm max.[1])
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 [2]

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.[3]


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[4] 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.[5]

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.[1][6]

There is reloading data available on a few websites[7] and in some handloading manuals, e.g. the Norwegian Ladeboken.[8] Ladeboken:

See also


  1. 1 2 3 4 http://www.cip-bobp.org/homologation/uploads/tdcc/tab-iv/tabivcal-en-page25.pdf
  2. Melvin, M., Capt., USMCR. Rifles and Machine Guns, p.385. New York,: William Morrow & Company, 1944.
  3. Janson, O. "Browning pistol M1903 becomes Swedish Pistol m/1907"
  4. Janson, O. "Equipment, holsters and ammunition for m/1907"
  5. Wilson, R. K. Textbook of Automatic Pistols, pp.237–238. Plantersville, S.C.: Small Arms Technical Publishing Company, 1943.
  6. http://www.prvipartizan.com
  7. 9mm Browning Long loading data at Gun Loads web site
  8. Ladeboken web site
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