Pistol · Not SAAMI standardized
.357 Herrett
Steve Herrett's wildcat for the Thompson/Center Contender single-shot pistol, based on trimmed .30-30 Winchester brass.
- Caliber
- 0.357″ · 9.068 mm
- Introduced
- 1971
- Case
- Rimless
- Parent
- .30-30 Winchester
- Primary use
- Self-Defense
- Status
- Limited
- Introduced
- 1971
- Type
- Pistol
- Origin
- United States
- Inventor
- Steve Herrett / Bob Milek
- Manufacturer
- Steve Herrett / Thompson/Center
- Standard
- Not SAAMI standardized
- Status
- Limited
- Availability
- Specialty
- Case capacity
- 34.5 gr H₂O
- Twist (typical)
- 1:14
- Primer
- Boxer Large Pistol
- Case type
- Rimless
- Max pressure
- 25,000 psi
- Eff. range
- 150 yd
- Recoil
- 10–15 ft·lb
- Subsonic
- Capable
Ballistics
Published velocity/energy data isn't available for .357 Herrett.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
reloading data · approximate| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.07 | 0.357 | · |
| Neck ⌀ | 9.47 | 0.373 | · |
| Shoulder ⌀ | 10.31 | 0.406 | · |
| Shoulder angle | 30° | — | ~ |
| Base ⌀ | 10.69 | 0.421 | · |
| Rim ⌀ | 12.85 | 0.506 | · |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.60 | 0.063 | · |
| Neck length | 9.09 | 0.358 | ≈ |
| Case length | 44.45 | 1.750 | · |
| Overall length | 60.96 | 2.400 | · |
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. .357 Herrett 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.
Lineage
Connected reference
History
Created in the 1970s by Steve Herrett for Thompson/Center Contender single-shot pistols. Necked-down .30-30 Winchester case to .357 caliber. Offered excellent single-shot handgun performance for metallic silhouette competition. Predecessor to the .357 Maximum.
FAQs
- What twist rate does .357 Herrett use?
- .357 Herrett typically uses a 1:14 twist rate.
- What bullet diameter is .357 Herrett?
- .357 Herrett uses a 0.357″ (9.068 mm) diameter bullet.
- Is .357 Herrett still in production?
- .357 Herrett is limited; typical availability is specialty.
- What is .357 Herrett used for?
- .357 Herrett is primarily used for self-defense.
Sources & provenance
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Manufacturer Hornady obsolete reloading data — .357 Herrett (30° shoulder, 1.750") · parent_cartridge
- Secondary MidwayUSA — RCBS Case Forming Die Set '357 Herrett from 30-30 Winchester' · parent_cartridge
- Secondary CartridgeCollector.net — .357 Herrett ('based on the 30-30 Winchester case ... shortened to 1.75" and necked to .357 cal') · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 12 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →