Lindcott Armory Rifle · SAAMI
.375 Winchester
The original Winchester Big Bore cartridge — parent case for the .307 and .356 Winchester.
- Caliber
- 0.376″ · 9.55 mm
- Introduced
- 1978
- Case
- Rimmed
- Parent
- .38-55 Winchester
- Primary use
- Hunting
- Status
- Active
- Introduced
- 1978
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester
- Standard
- SAAMI
- Status
- Active
- Availability
- Limited
- Case capacity
- 52 gr H₂O
- Twist (typical)
- 1:12
- Primer
- Large Rifle
- Case type
- Rimmed
- Max pressure
- 52,000 psi
- Eff. range
- 200 yd
- Max range
- 400 yd
- Recoil
- 12–18 ft·lb
Ballistics
- By real loads
- 1,900–2,200 fps · 16 loads
- Parent case
- .38-55 Winchester
Representative trajectory — modeled from a single velocity input (no published BC for this cartridge yet).
Performance
Buy links open .375 Winchester ammunition at Rivertown Munitions.
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 ⌀ | 9.55 | 0.376 | ✓ |
| Neck ⌀ | 10.16 | 0.400 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 10.71 | 0.422 | ✓ |
| Rim ⌀ | 12.85 | 0.506 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.60 | 0.063 | ✓ |
| Neck length | n/a | ||
| Case length | 51.31 | 2.020 | ✓ |
| Overall length | 65.02 | 2.560 | ✓ |
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. .375 Winchester is highlighted below.
Factory loads
In production — 16 active loads across 7 brands. Top 15 shown · see all 16 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Federal | Power-Shok | 200 | Power-Shok SP | 2,200 | 2,149 | — |
| Buffalo Bore | Heavy | 200 | Jacketed Flat Nose | 2,200 | 2,149 | — |
| Winchester | Super-X | 200 | Flex Tip | 2,200 | 2,149 | — |
| HSM | HSM Trophy Gold | 200 | Monolithic Solid | 2,200 | 2,149 | — |
| Buffalo Bore | Heavy | 220 | Jacketed Flat Nose | 2,150 | 2,258 | — |
| Winchester | Super-X | 220 | Lead Flat Nose | 2,150 | 2,258 | — |
| HSM | HSM Trophy Gold | 220 | TSX | 2,150 | 2,258 | — |
| Black Hills | Standard | 220 | JSP | 2,100 | 2,154 | — |
| Hornady | Custom | 220 | RN | 2,100 | 2,154 | — |
| PPU | Standard | 220 | SP | 2,100 | 2,154 | — |
| Buffalo Bore | Heavy | 250 | Jacketed Flat Nose | 1,900 | 2,004 | — |
| Hornady | Custom | 255 | LFP | 1,900 | 2,044 | — |
| Federal | Power-Shok | 250 | Power-Shok SP | 1,900 | 2,004 | — |
| Black Hills | Standard | 255 | FP | 1,900 | 2,044 | — |
| PPU | Standard | 255 | SP | 1,900 | 2,044 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
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 .375 Winchester
7 models in the database chamber .375 Winchester. Browse all →
Lineage
Connected reference
History
Introduced in 1978 for the Winchester Model 94 Big Bore — a strengthened version of the classic Model 94 capable of handling higher-pressure cartridges. The .375 Winchester launched the Big Bore family; the .307 and .356 Winchester followed in 1982 as rimmed versions of .308 and .356. Factory ammunition remains available from Winchester. The Big Bore 94s are valued by hunters who want a powerful, compact lever-action.
FAQs
- What twist rate does .375 Winchester use?
- .375 Winchester typically uses a 1:12 twist rate.
- What bullet diameter is .375 Winchester?
- .375 Winchester uses a 0.376″ (9.55 mm) diameter bullet.
- Is .375 Winchester still in production?
- .375 Winchester is active; typical availability is limited.
- What is .375 Winchester used for?
- .375 Winchester is primarily used for hunting.
- What is .375 Winchester based on?
- .375 Winchester is derived from the .38-55 Winchester case.
Sources & provenance
- StandardSAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawingsarchived
- StandardC.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 16 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →