Pistol · Obsolete / Non-standard
.455 Webley Auto
Cartridge for the Webley-Fosbery Automatic Revolver and Webley semi-automatic pistols.
- Caliber
- 0.4543″ · 11.54 mm
- Introduced
- 1900
- Case
- Semi-Rimmed
- Primary use
- military
- Status
- Obsolete
- Introduced
- 1900
- Type
- Pistol
- Origin
- United Kingdom
- Inventor
- Webley & Scott
- Manufacturer
- Webley & Scott
- Standard
- Obsolete / Non-standard
- Status
- Obsolete
- Availability
- Antique
- Case capacity
- 22 gr H₂O
- Twist (typical)
- 1:20
- Primer
- Large Pistol
- Case type
- Semi-Rimmed
- Max pressure
- 25,000 psi
- Eff. range
- 50 yd
- Recoil
- 2.5–3.5 ft·lb
- Subsonic
- Capable
Introduced by Webley & Scott
Ballistics
Published velocity/energy data isn't available for .455 Webley Auto — 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.
mixed/other · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 11.54 | 0.454 | ✓ |
| Neck ⌀ | 12.02 | 0.473 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 12.08 | 0.476 | ✓ |
| Rim ⌀ | 12.76 | 0.502 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.18 | 0.046 | ~ |
| Neck length | n/a | ||
| Case length | 23.25 | 0.915 | ~ |
| Overall length | 31.00 | 1.220 | ✓ |
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. .455 Webley Auto 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 .455 Webley Auto
4 models in the database chamber .455 Webley Auto. Browse all →
Connected reference
History
Webley's semi-automatic pistol cartridge variant, developed for the Webley & Scott self-loading pistol adopted by the Royal Navy and Royal Flying Corps in WWI. The Auto designation distinguishes it from the rimmed Webley revolver cartridge. Used by British aviators as a sidearm during aerial warfare.
FAQs
- What twist rate does .455 Webley Auto use?
- .455 Webley Auto typically uses a 1:20 twist rate.
- What bullet diameter is .455 Webley Auto?
- .455 Webley Auto uses a 0.4543″ (11.54 mm) diameter bullet.
- Is .455 Webley Auto still in production?
- .455 Webley Auto is obsolete; typical availability is antique.
- What is .455 Webley Auto used for?
- .455 Webley Auto is primarily used for military.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 7 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →