9mm Browning Long

9×20mm Browning Long
9mm long cartridge.jpg
TypeSemi-automatic pistol
Place of originBelgium
Production history
DesignerJohn Moses Browning
ManufacturerFabrique Nationale de Herstal
Case typesemi-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 length20 mm (0.79 in)
Overall length1.10 in (28 mm)
Primer typeSmall 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)
108 gr (7 g) FMJ 1,150 ft/s (350 m/s) 316 ft⋅lbf (428 J)
Source(s): Rifles and Machine Guns [2] Prvi Partizan [3]

The 9mm Browning Long [9 x 20mm SR] is a military centerfire pistol cartridge developed in 1903 for the FN Model 1903 adopted by Belgium, France, Estonia, the Netherlands, and Sweden.[4]


9mm Browning Long is similar to the 9×19mm Parabellum, but has a slightly longer casing and is semi-rimmed; the cartridge headspaces on the rim. The cartridge was developed by FN to be used in the blowback-operated Model 1903, a scaled-up version of the Colt 1903. Using a more powerful cartridge, such as the 9×19mm Parabellum, would have required a locked-breech design. Ammunition was produced in Belgium, France, England, Sweden[5] 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.[6]

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.

Prvi Partizan in Serbia manufactured 9mm Browning Long ammunition into the 2000s. The Prvi full metal jacket bullet weighs 7 grams (108 gr.) with a muzzle velocity of 350 metres (1,150 ft) per second.[7]

There is reloading data available on a few websites[8] and in some handloading manuals, e.g. the Norwegian Ladeboken.[9] Ladeboken:

See also[]


  1. ^ a b c "C.I.P. TDCC datasheet 9 mm Browning long" (PDF). CIP. September 23, 2008.
  2. ^ Melvin, M., Capt., USMCR. Rifles and Machine Guns, p.385. New York,: William Morrow & Company, 1944.
  3. ^ Prvi Partizan
  4. ^ Janson, O. "Browning pistol M1903 becomes Swedish Pistol m/1907"
  5. ^ Janson, O. "Equipment, holsters and ammunition for m/1907"
  6. ^ Wilson, R. K. Textbook of Automatic Pistols, pp.237–238. Plantersville, S.C.: Small Arms Technical Publishing Company, 1943.
  7. ^ "9mm Browning Long". prvi partizan. Retrieved 26 October 2017.
  8. ^ 9mm Browning Long loading data at Gun Loads website
  9. ^ "Ladeboken web site". Archived from the original on 2020-10-28. Retrieved 2010-08-15.