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 based on?

.380/200 is derived from the .38 S&W case.

Lindcott Armory

Pistol · Military

.380/200

Also known as .38-200 · Enfield No.2 cartridge · .380 British Service · .380 Revolver Mk II

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: 1927
Case: Rimmed
Parent: .38 S&W
Primary use: Military service
Status: Discontinued

Buy this cartridge

Buy at Rivertown

Buying from Rivertown

Partner link

Velocity—–620 fps

Identity

Introduced: 1927
Type: Pistol
Origin: United Kingdom
Inventor: Various / British military
Standard: Military
Status: Discontinued
Availability: Rare

Build

Primer: Small Pistol
Case type: Rimmed

Pressure & range

Max pressure: 14,500 psi
Eff. range: 25 yd

Ballistics

Representative trajectory · velocity only, no drag model · 25 yd zero0–200 yd

Drop Zero

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.

Powder $/lb Charge (gr) Bullet $/ea Primer $/ea Brass reuses Brass $/ea

Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.

Firearms chambered in .380/200

2 models in the database chamber .380/200. Browse all →

Enfield No. 2 Mk IWebley & Scott Mk IV .38

Lineage

Family TreeOpen .380/200 in the interactive cartridge family tree

Connected reference

FirearmsFirearms in .380/200 ToolCompare ballistics

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 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 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
primary 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 →