9×23mm Largo

The 9×23mm Largo (9mm Largo, 9mm Bergmann–Bayard, 9mm Bayard Long) centerfire pistol cartridge was developed in 1901 for the Bergmann Mars pistol.

9mm Bergmann–Bayard, 9mm Largo
TypePistol
Place of originGerman Empire
Service history
Used bySpain
Denmark
Production history
DesignerTheodor Bergmann
Designed1901
Specifications
Case typeRimless, tapered
Bullet diameter9.02 mm (0.355 in)
Neck diameter9.63 mm (0.379 in)
Base diameter9.91 mm (0.390 in)
Rim diameter9.96 mm (0.392 in)
Rim thickness1.2 mm (0.047 in)
Case length23.11 mm (0.910 in)
Overall length33.53 mm (1.320 in)
Primer typeSmall 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)
Test barrel length: 150 mm (5.9 in)
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