Pistol · Military · Not SAAMI standardized · Not standardizedObsolete
.380/200
British military revolver cartridge for the Enfield No.2 Mk I revolver, essentially a .38 S&W loaded with a 200-grain bullet; standard British sidearm cartridge through World War II..
- Caliber
- 0.361″ · 9.17 mm
- Introduced
- 1922
- Case
- Rimmed
- Parent
- .38 S&W
- Primary use
- Self-Defense, Target
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1922
- Type
- Pistol
- Origin
- United Kingdom
- Inventor
- Various / British military
- Manufacturer
- United Kingdom state arsenals
- Standard
- Military · Not SAAMI standardized · Not standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Rare
- Case capacity
- 14.1 gr H₂O
- Twist (typical)
- 1:19
- Primer
- Small Pistol
- Case type
- Rimmed
- Max pressure
- 14,500 psi, CIP transducer
- Eff. range
- 25 yd
- Max range
- 1700 yd
- Recoil
- 1.2–3.2 ft·lb
- Subsonic
- Capable
Ballistics
Velocity only, no drag model: no published ballistic coefficient is on file for .380/200, so this is the shape gravity alone gives the advertised velocity. Drag would steepen it. The tool below solves real loads through their published G1 or G7 model.
Open in Ballistic Compare- Parent case
- .38 S&W
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.17 | 0.361 | ✓ |
| Neck ⌀ | 9.79 | 0.385 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 9.82 | 0.387 | ✓ |
| Rim ⌀ | 11.18 | 0.440 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.40 | 0.055 | ✓ |
| Neck length | n/a | ||
| Case length | 19.69 | 0.775 | ✓ |
| Overall length | 31.50 | 1.240 | ✓ |
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. .380/200 is highlighted below.
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 .380/200
Lineage
Connected reference
History
Adopted in 1927 for the Enfield No.2 Mk I revolver, the .380/200 used a .38 S&W case with a 200-grain bullet to meet British military specifications. It served throughout World War II alongside the Webley Mk IV revolver also rechambered for this cartridge. Post-war it was replaced by the 9mm Parabellum.
FAQs
- What twist rate does .380/200 use?
- .380/200 typically uses a 1:19 twist rate.
- What bullet diameter is .380/200?
- .380/200 uses a 0.361″ (9.17 mm) diameter bullet.
- Is .380/200 still in production?
- .380/200 is discontinued; typical availability is rare.
- What is .380/200 used for?
- .380/200 is primarily used for self-defense, target.
- What is .380/200 based on?
- .380/200 is derived from the .38 S&W case.
Sources & provenance
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Reference The Smith & Wesson .38 Special and .38-200 Cartridge · velocity_max_fps
- Secondary British Military Small Arms Ammo — .380 inch Ball · velocity_max_fps
Data & sources. Specs compiled from the Lindcott Armory reference; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
