Pistol · Obsolete
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
- Parent
- 9mm Browning Long
- Primary use
- Military
- Status
- Discontinued
- Introduced
- 1903
- Type
- Pistol
- Origin
- Belgium
- Inventor
- Theodore Bergmann
- Manufacturer
- Anciens Établissements Pieper (Belgium), various Spanish
- Standard
- 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
- Eff. range
- 50 yd
- Max range
- 100 yd
- Recoil
- 4–6.5 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for 9mm Largo — an obsolete/collector cartridge. Parent case: 9mm Browning Long.
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 | 0.50 | 0.020 | ~ |
| 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
12 models in the database chamber 9mm Largo. Browse all →
Lineage
Most-direct documented parent is 9mm Bergmann-Bayard (not yet in the reference).
Connected reference
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.
- What is 9mm Largo based on?
- 9mm Largo is derived from the 9mm Browning Long case.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Manufacturer Steinel Ammunition Co. — 9mm Largo 124gr. FMJ - 50 Count · grain_ballistics, representative_gun archived
- Manufacturer Ventura Munitions (Ventura Heritage) — Ventura Heritage 9mm Largo 124gr TMJ Ammo - 50 Rounds · grain_ballistics, representative_gun 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 →