Rifle · Not SAAMI standardized · CIP standardizedObsolete
.45-75 Winchester
Original cartridge for the Winchester Model 1876 — the first Winchester large-bore repeating rifle capable of handling true big-game cartridges.
- Caliber
- 0.4484″ · 11.39 mm
- Introduced
- 1876
- Case
- Rimmed
- Parent
- .45-70 Government
- Primary use
- Hunting, Military
- Status
- Discontinued
- Obsolete
- Obsolete
- Introduced
- 1876
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester Repeating Arms
- Standard
- Not SAAMI standardized · CIP standardized
- SAAMI
- Not SAAMI standardized
- Obsolete
- Obsolete
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 75 gr H₂O
- Twist (typical)
- 1:20
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 29,733 psi, CIP transducer
- Eff. range
- 175 yd
- Max range
- 3650 yd
- Recoil
- 12–18 ft·lb
- Subsonic
- Capable
Introduced by Winchester Repeating Arms
Ballistics
Published velocity/energy data isn't available for .45-75 Winchester — an obsolete/collector cartridge. Parent case: .45-70 Government.
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 ⌀ | 11.39 | 0.448 | ~ |
| Neck ⌀ | 12.20 | 0.480 | · |
| Shoulder ⌀ | 13.87 | 0.546 | · |
| Shoulder angle | 7.2° | — | ~ |
| Base ⌀ | 14.24 | 0.561 | · |
| Rim ⌀ | 15.81 | 0.622 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.41 | 0.056 | · |
| Neck length | 15.40 | 0.606 | ≈ |
| Case length | 47.86 | 1.884 | · |
| Overall length | 56.52 | 2.225 | · |
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. .45-75 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.
Firearms chambered in .45-75 Winchester
Lineage
History
Developed in 1876 for the Winchester Centennial rifle (Model 1876), Winchester's answer to demands for a large-bore repeating rifle. It was one of Theodore Roosevelt's preferred cartridges during his ranching days. The Northwest Mounted Police adopted the Model 1876 in .45-75. Factory ammunition was discontinued in the early 20th century; reproduction cartridges are available from specialty suppliers for Uberti and Chiappa replicas.
FAQs
- What twist rate does .45-75 Winchester use?
- .45-75 Winchester typically uses a 1:20 twist rate.
- What bullet diameter is .45-75 Winchester?
- .45-75 Winchester uses a 0.4484″ (11.39 mm) diameter bullet.
- Is .45-75 Winchester still in production?
- .45-75 Winchester is discontinued; typical availability is collector.
- What is .45-75 Winchester used for?
- .45-75 Winchester is primarily used for hunting, military.
- What is .45-75 Winchester based on?
- .45-75 Winchester is derived from the .45-70 Government case.
Sources & provenance
- Standard SAAMI — SAAMI cartridge & chamber drawing — .45-75 Winchester archived
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 5 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
