Lindcott Armory 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
- By real loads
- 1,083–1,200 fps · 10 loads
- Parent case
- 9mm Browning Long
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Performance
Buy links open 9mm Largo ammunition at Rivertown Munitions.
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
In production — 10 active loads across 6 brands. Top 15 shown · see all 21 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Geco | Range | 124 | FMJ | 1,200 | 396 | — |
| Norma | Safeguard | 124 | FMJ | 1,200 | 396 | — |
| MEN | Standard | 124 | FMJ | 1,200 | 396 | — |
| Sellier & Bellot | FMJ Service | 124 | FMJ | 1,200 | 396 | — |
| Fiocchi | FMJ Service | 124 | FMJ | 1,200 | 396 | — |
| Fiocchi | Range | 124 | FMJ | 1,200 | 396 | — |
| Sellier & Bellot | Sport | 124 | FMJ | 1,200 | 396 | — |
| PPU | Range | 124 | FMJ | 1,200 | 396 | — |
| Sellier & Bellot | FMJ | 130 | FMJ | 1,083 | 339 | — |
| Fiocchi | FMJ | 130 | FMJ | 1,083 | 339 | — |
| Kynoch | Classic | 124 | FMJ | 1,230 | 416 | — |
| Sellier & Bellot | SP | 124 | FMJ | 1,230 | 416 | — |
| PPU | Standard | 124 | FMJ | 1,230 | 416 | — |
| Buffalo Arms | Custom | 124 | FMJ | 1,230 | 416 | — |
| Norma | Classic | 124 | FMJ | 1,230 | 416 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
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
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 →