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Lindcott Armory Lindcott Armory
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Pistol · SAAMI

.357 SIG

Also known as 9x22mm · .357 SIG Sauer

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

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VelocityBeing verified
EnergyBeing verified
Typical grains115 · 124 · 125 gr
Identity
Introduced
1994
Type
Pistol
Origin
Switzerland/USA
Inventor
SIG Sauer / Federal
Manufacturer
SIG Sauer
Standard
SAAMI
Status
Active
Availability
Common
Build
Case capacity
19.5 gr H₂O
Twist (typical)
1:16
Primer
Small Pistol
Case type
Rimless
Pressure & range
Max pressure
40,000 psi, SAAMI transducer
Eff. range
50 yd
Max range
1900 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

Best for Withheld until verified
Best for Withheld until verified
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
Measuremmin✓
Bullet ⌀ 9.020.355 ✓
Neck ⌀ 9.680.381 ✓
Shoulder ⌀ 10.770.424 ✓
Shoulder angle 18°— ✓
Base ⌀ 10.770.424 ✓
Rim ⌀ 10.770.424 ✓
Belt ⌀ n/a
Rim thickness 1.400.055 ✓
Neck length 3.810.150 ≈
Case length 21.970.865 ✓
Overall length 28.961.140 ✓

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

Verification

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 →

Vihtavuori N340N350WAPVihtavuori 3N37Alliant Power PistolVihtavuori 3N38
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

Glock Glock 31 Gen 5 MOSGlock Glock 31 Gen 5SIG Sauer P320 AXG Pro 9mm 4.7-inchSIG Sauer Sig Sauer P320 10mm 4.7-inchCMMG Banshee .357 SIGCMMG Banshee .357 SIG 5-inchSmith & Wesson M&P M2.0 .357 SIG Compact 3.6-inchGlock G31 Gen 5SIG Sauer Sig P320 XFULL 9mm 4.7-inchKriss Vector Gen 2 .357 SIG SDPSmith & Wesson M&P M2.0 .357 SIG 4.25-inchSIG Sauer P229 Legion SAO

Lineage

Immediate parent
.40 S&W · Necked down from
Family TreeOpen .357 SIG in the interactive cartridge family tree

Connected reference

Reloading6 suitable powders — cross-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

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 79 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →

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