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9x23mm Largo

9x23mm Largo Ammo For Sale From Various Retailers

The 9×23mm Largo, also known as 9mm Largo, 9mm Bergmann–Bayard, 9mm Bayard Long centerfire pistol cartridge was developed in 1901 for the Bergmann Marspistol. The round is a 9x23mm round, slightly longer than the standard 9x19 NATO rounds. The 9mm Largo round was considered to be quite potent in 1903, especially for an automatic pistol.

While the 9mm Largo was originally designed for pistol it did find its way into a few different carbines. It has been more popular in Latin American countries, especially Mexico where any caliber used by the military is banned. Largo round also went on to serve with the Danish Military and was in service to 1935.

About 9x23mm Largo

  • Type: Pistol
  • Place of origin: German Empire
  • Designer: Theodor Bergmann
  • Designed: 1901


  • Case type: Rimless, tapered
  • Bullet diameter: 9.02 mm (0.355 in)
  • Neck diameter: 9.63 mm (0.379 in)
  • Base diameter: 9.91 mm (0.390 in)
  • Rim diameter: 9.96 mm (0.392 in)
  • Case length: 23.11 mm (0.910 in)
  • Overall length: 33.53 mm (1.320 in)
  • Primer type: Small pistol

Ballistic performance

Bullet mass/type Velocity Energy
127 gr (8 g) FMJ 1,167 ft/s (356 m/s) 384 ft⋅lbf (521 J)

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