Rifle · SAAMI
.376 Steyr
The .376 Steyr was developed by Steyr Mannlicher in collaboration with Hornady and Jeff Cooper in 1999, designed specifically for the Steyr Scout rifle in a dangerous game configuration.
- Caliber
- 0.375″ · 9.525 mm
- Introduced
- 1999
- Case
- Rimless
- Parent
- 9.3x64mm Brenneke
- Primary use
- hunting_large_game, hunting_dangerous_game
- Status
- Limited
- Introduced
- 1999
- Type
- Rifle
- Origin
- Austria
- Inventor
- Jeff Cooper, Steyr Mannlicher, Hornady
- Manufacturer
- Hornady, Steyr
- Standard
- SAAMI
- Status
- Limited
- Availability
- Rare
- Case capacity
- 80 gr H₂O
- Twist (typical)
- 1:304.8
- Primer
- Large Rifle
- Case type
- Rimless
- Max pressure
- 62,000 psi, SAAMI transducer
- Eff. range
- 300 yd
- Max range
- 4350 yd
- Recoil
- 36.4–48.8 ft·lb
Ballistics
Published velocity/energy data isn't available for .376 Steyr. Parent case: 9.3x64mm Brenneke.
Performance
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 ⌀ | 9.53 | 0.375 | ✓ |
| Neck ⌀ | 10.11 | 0.398 | ✓ |
| Shoulder ⌀ | 12.02 | 0.473 | ✓ |
| Shoulder angle | 17.5° | — | ✓ |
| Base ⌀ | 12.72 | 0.501 | ✓ |
| Rim ⌀ | 12.55 | 0.494 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | 9.03 | 0.356 | ≈ |
| Case length | 60.00 | 2.362 | ✓ |
| Overall length | 79.00 | 3.110 | ✓ |
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. .376 Steyr is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
1 reloading powder listed for .376 Steyr, fastest to slowest. Cross-reference in the finder →
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 .376 Steyr
Lineage
Necked up to .375 and shortened about 4 mm
Connected reference
History
Jeff Coopers Scout rifle concept specified a lightweight, general-purpose bolt-action handling to 1,000 meters but equally capable on dangerous game at close range. The standard Scout chamberings (.308 Win, .350 Rem Mag) were considered marginal for lion, leopard, and buffalo. Steyr and Hornady developed the .376 Steyr to fill this gap — a cartridge generating over 4,000 ft-lbs while fitting in a short-action envelope. The Steyr Scout in .376 was Coopers preferred dangerous game Scout configuration.
FAQs
- What twist rate does .376 Steyr use?
- .376 Steyr typically uses a 1:304.8 twist rate.
- What bullet diameter is .376 Steyr?
- .376 Steyr uses a 0.375″ (9.525 mm) diameter bullet.
- Is .376 Steyr still in production?
- .376 Steyr is limited; typical availability is rare.
- What is .376 Steyr used for?
- .376 Steyr is primarily used for hunting_large_game, hunting_dangerous_game.
- What is .376 Steyr based on?
- .376 Steyr is derived from the 9.3x64mm Brenneke case.
- What are the best powders for .376 Steyr?
- Reloading powders commonly listed for .376 Steyr include Reloader 19.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Standard C.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 20 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
