Pistol · SAAMI
.357 SIG
High-performance bottleneck pistol cartridge.
- Caliber
- 0.355″ · 9.017 mm
- Introduced
- 1994
- Case
- Rimless
- Parent
- .40 S&W
- Primary use
- Self Defense
- Status
- Active
- Introduced
- 1994
- Type
- Pistol
- Origin
- Switzerland/USA
- Inventor
- SIG Sauer / Federal
- Manufacturer
- SIG Sauer
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 16.6 gr H₂O
- Twist (typical)
- 1:16
- Primer
- Small Pistol
- Case type
- Rimless
- Max pressure
- 40,000 psi
- Eff. range
- 50 yd
- Recoil
- 8–12 ft·lb
Introduced by SIG Sauer
Ballistics
Published velocity/energy data isn't available for .357 SIG. Parent case: .40 S&W.
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 ⌀ | 9.02 | 0.355 | ✓ |
| Neck ⌀ | 9.68 | 0.381 | ✓ |
| Shoulder ⌀ | 10.77 | 0.424 | ✓ |
| Shoulder angle | 18° | — | ✓ |
| Base ⌀ | 10.77 | 0.424 | ✓ |
| Rim ⌀ | 10.77 | 0.424 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.40 | 0.055 | ✓ |
| Neck length | 3.81 | 0.150 | ≈ |
| Case length | 21.97 | 0.865 | ✓ |
| Overall length | 28.96 | 1.140 | ✓ |
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 SIG is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
6 reloading powders listed for .357 SIG, 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 .357 SIG
12 models in the database chamber .357 SIG. Browse all →
Lineage
Connected reference
History
Developed 1994 by SIG and Federal to duplicate .357 Magnum 125gr performance in semi-auto. Adopted by several federal agencies and state troopers. Reliability benefits from bottleneck design.
FAQs
- What twist rate does .357 SIG use?
- .357 SIG typically uses a 1:16 twist rate.
- What bullet diameter is .357 SIG?
- .357 SIG uses a 0.355″ (9.017 mm) diameter bullet.
- Is .357 SIG still in production?
- .357 SIG is active; typical availability is common.
- What is .357 SIG used for?
- .357 SIG is primarily used for self defense.
- What is .357 SIG based on?
- .357 SIG is derived from the .40 S&W case.
- What are the best powders for .357 SIG?
- Reloading powders commonly listed for .357 SIG include Vihtavuori N340, N350, WAP, Vihtavuori 3N37, among 6 suitable options.
Sources & provenance
- Standard SAAMI — SAAMI cartridge & chamber drawing — .357 SIG archived
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Standard SAAMI — ANSI/SAAMI Z299.3-2022 — Centerfire Pistol & Revolver Voluntary Performance Standards · grain_ballistics, representative_gun archived
- Manufacturer Hornady — 357 Sig 147 gr XTP (Custom) · representative_gun, grain_ballistics archived
- Manufacturer Federal Premium — American Eagle Handgun 357 Sig, 125 Grain FMJ (AE357S2) · grain_ballistics, representative_gun archived
- Manufacturer Speer — Gold Dot Handgun Personal Protection 357 Sig, 125 Grain (23918GD) · grain_ballistics, representative_gun archived
- Manufacturer Federal Premium — Personal Defense HST 357 Sig, 125 Grain (P357SHST1S) · grain_ballistics, representative_gun archived
- Manufacturer Speer — Gold Dot Handgun Component Bullet, 357 Sig, 125 Grain (19-4360) · grain_ballistics, representative_gun archived
- Manufacturer Hornady — 357 Sig 135 gr FlexLock Critical Duty · grain_ballistics, representative_gun archived
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 82 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →