Rifle · CIP standardized
.425 Westley Richards
Westley Richards' powerful rimless cartridge for large and dangerous African game.
- Caliber
- 0.435″ · 11.049 mm
- Introduced
- 1904
- Case
- Rimless
- Primary use
- Hunting
- Status
- Limited
- Introduced
- 1904
- Type
- Rifle
- Origin
- United Kingdom
- Inventor
- Westley Richards
- Manufacturer
- Westley Richards
- Standard
- CIP standardized
- Status
- Limited
- Availability
- Limited
- Case capacity
- 100 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Boxer Large Rifle
- Case type
- Rimless
- Max pressure
- 47,000 psi
- Eff. range
- 300 yd
- Recoil
- 40–55 ft·lb
Introduced by Westley Richards
Ballistics
Published velocity/energy data isn't available for .425 Westley Richards.
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 ⌀ | 11.05 | 0.435 | ~ |
| Neck ⌀ | 11.58 | 0.456 | · |
| Shoulder ⌀ | 13.72 | 0.540 | · |
| Shoulder angle | — | — | |
| Base ⌀ | 13.79 | 0.543 | · |
| Rim ⌀ | 11.86 | 0.467 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | — | — | |
| Neck length | — | — | |
| Case length | 67.06 | 2.640 | · |
| Overall length | 83.82 | 3.300 | · |
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. .425 Westley Richards is highlighted below.
Missing a dimension for .425 Westley Richards? Some case measurements aren't in a published SAAMI/CIP drawing yet. Have a factory or reamer print? Send it → — verified hard-to-find data earns a free Lindcott sticker.
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 .425 Westley Richards
1 model in the database chamber .425 Westley Richards. Browse all →
Connected reference
History
Westley Richards developed this rimless cartridge in 1904 for African hunting. Fires 410-grain bullets at 2,350–2,400 fps with a flat trajectory; designed as a multi-purpose dangerous game round. Remains in production by a few specialists for collectors and professional hunters using older double rifles.
FAQs
- What twist rate does .425 Westley Richards use?
- .425 Westley Richards typically uses a 1:14 twist rate.
- What bullet diameter is .425 Westley Richards?
- .425 Westley Richards uses a 0.435″ (11.049 mm) diameter bullet.
- Is .425 Westley Richards still in production?
- .425 Westley Richards is limited; typical availability is limited.
- What is .425 Westley Richards used for?
- .425 Westley Richards is primarily used for hunting.
Sources & provenance
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 20 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →