Pistol · Not SAAMI standardized · Not standardizedObsolete
9mm Largo
Powerful 9mm cartridge adopted by Spain and Belgium in the early 20th century.
- Caliber
- 0.3551″ · 9.02 mm
- Introduced
- 1903
- Case
- Rimless
- Primary use
- Military
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1903
- Type
- Pistol
- Origin
- Belgium
- Inventor
- Theodore Bergmann
- Manufacturer
- Anciens Établissements Pieper (Belgium), various Spanish
- Standard
- Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 15.5 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Small Pistol
- Case type
- Rimless
- Max pressure
- 34,084 psi, CIP transducer
- Eff. range
- 50 yd
- Max range
- 1700 yd
- Recoil
- 4–6.5 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for 9mm Largo — an obsolete/collector cartridge.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
SAAMI · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.02 | 0.355 | · |
| Neck ⌀ | 9.58 | 0.377 | ~ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 9.91 | 0.390 | · |
| Rim ⌀ | 9.90 | 0.390 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ~ |
| Neck length | n/a | ||
| Case length | 23.00 | 0.906 | · |
| Overall length | 33.50 | 1.319 | · |
Size vs familiar rounds
Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. 9mm Largo is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Firearms chambered in 9mm Largo
Lineage
History
Originally developed for Theodore Bergmann's Model 1903 pistol, adopted by Belgium as the Bergmann-Bayard M1910. Spain adopted it as the standard military cartridge and chambered it in the Astra 400, 600, and Star Model B pistols for decades. Spanish forces used it through the Civil War and WWII. The cartridge remained in Spanish military service until the 1980s, with factory ammunition available until recently.
FAQs
- What twist rate does 9mm Largo use?
- 9mm Largo typically uses a 1:10 twist rate.
- What bullet diameter is 9mm Largo?
- 9mm Largo uses a 0.3551″ (9.02 mm) diameter bullet.
- Is 9mm Largo still in production?
- 9mm Largo is discontinued; typical availability is collector.
- What is 9mm Largo used for?
- 9mm Largo is primarily used for military.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Manufacturer Ventura Munitions (Ventura Heritage) — Ventura Heritage 9mm Largo 124gr TMJ Ammo - 50 Rounds · representative_gun, grain_ballistics archived
- Manufacturer Steinel Ammunition — 9mm Largo 124gr. FMJ - 50 Count · representative_gun, grain_ballistics archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 10 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
