Rifle · Obsolete
.401 Winchester
Winchester's early semi-rimless self-loading cartridge for the Model 1910 rifle.
- Caliber
- 0.4065″ · 10.325 mm
- Introduced
- 1910
- Case
- Rimless
- Primary use
- Hunting
- Status
- Discontinued
- Introduced
- 1910
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester Repeating Arms
- Standard
- Obsolete
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 35 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Boxer Large Rifle
- Case type
- Rimless
- Max pressure
- 47,000 psi
- Eff. range
- 150 yd
- Recoil
- 12–18 ft·lb
Introduced by Winchester Repeating Arms
Ballistics
Published velocity/energy data isn't available for .401 Winchester — 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.
Wikipedia · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 10.32 | 0.406 | ~ |
| Neck ⌀ | 10.87 | 0.428 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 10.90 | 0.429 | ✓ |
| Rim ⌀ | 11.61 | 0.457 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | n/a | ||
| Case length | 38.10 | 1.500 | ✓ |
| Overall length | 50.93 | 2.005 | ✓ |
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. .401 Winchester 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.
Connected reference
History
Winchester introduced this early semi-rimless cartridge for the Model 1910 self-loading rifle. Fired a 200-grain bullet at ~2,135 fps; designed as a police and game cartridge for semi-automatic rifles. Discontinued when the Model 1910 was phased out.
FAQs
- What twist rate does .401 Winchester use?
- .401 Winchester typically uses a 1:16 twist rate.
- What bullet diameter is .401 Winchester?
- .401 Winchester uses a 0.4065″ (10.325 mm) diameter bullet.
- Is .401 Winchester still in production?
- .401 Winchester is discontinued; typical availability is collector.
- What is .401 Winchester used for?
- .401 Winchester is primarily used for hunting.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 1 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →