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Lindcott Armory

Pistol · SAAMI

10mm Auto

Also known as 10x25mm

Powerful auto pistol cartridge.

Caliber
0.4004″ · 10.17 mm
Introduced
1983
Case
Rimless
Parent
.30 Remington
Primary use
Hunting, Self Defense, Target
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains155 · 180 · 200 gr
Identity
Introduced
1983
Type
Pistol
Origin
United States
Inventor
Jeff Cooper / Whit Collins
Manufacturer
Norma
Standard
SAAMI
Status
Active
Availability
Common
Build
Case capacity
24.1 gr H₂O
Twist (typical)
1:16
Primer
Large Pistol
Case type
Rimless
Pressure & range
Max pressure
37,500 psi
Eff. range
75 yd
Recoil
14–22 ft·lb

Introduced by Norma

Ballistics

Published velocity/energy data isn't available for 10mm Auto. Parent case: .30 Remington.

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 ⌀ 10.170.400 ✓
Neck ⌀ 10.740.423 ✓
Shoulder ⌀ n/a
Shoulder angle n/a
Base ⌀ 10.800.425 ✓
Rim ⌀ 10.800.425 ✓
Belt ⌀ n/a
Rim thickness 1.400.055 ✓
Neck length n/a
Case length 25.200.992 ✓
Overall length 32.001.260 ✓

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. 10mm Auto is highlighted below.

Factory loads

Verification

Being verified

Advertised FPS, energy, and BC are withheld until loads clear verification.

Suitable powders

20 reloading powders listed for 10mm Auto, fastest to slowest. Cross-reference in the finder →

Vihtavuori N320IMR Hi-Skor 800XCFE PistolVihtavuori N340UniversalHP-38N350HercoD073.3Power Pro 300-MPEnforcerCSP2LongshotShooters World Major PistolVihtavuori 3N37Alliant Power PistolNo. 9Vihtavuori 3N38Reloader 10xN105
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 10mm Auto

12 models in the database chamber 10mm Auto. Browse all →

Glock Glock 29 Gen 5 FS NS MOSWalther PDP Compact 3.5-inch 10mmGlock Glock 29 Gen 5 MOSGlock Glock 29 Gen 5 FSSpringfield Armory Prodigy 10mmPalmetto State Armory AK-V 10mmSpringfield Armory XDM-9 10mmGlock G20 Gen5Glock G20 Gen5 SFSig Sauer P220 10mm Auto 4.4-inchGlock G29 Gen5Taurus G3 10mm

Lineage

Immediate parent
.30 Remington

via .40 G&A: shortened, opened to .40

Direct descendants (2 · 3 total)
.40 S&W.338 Razorback9x25 Dillon
Family TreeOpen 10mm Auto in the interactive cartridge family tree

Connected reference

Loads227 factory loads for 10mm AutoReloading20 suitable powders — cross-referenceFirearmsFirearms in 10mm Auto

History

Developed in early 1980s by Jeff Cooper as ideal combat pistol cartridge. FBI adopted in 1989 but withdrew after agents complained of recoil. That failure led to .40 S&W. Cult following remains.

FAQs

What twist rate does 10mm Auto use?
10mm Auto typically uses a 1:16 twist rate.
What bullet diameter is 10mm Auto?
10mm Auto uses a 0.4004″ (10.17 mm) diameter bullet.
Is 10mm Auto still in production?
10mm Auto is active; typical availability is common.
What is 10mm Auto used for?
10mm Auto is primarily used for hunting, self defense, target.
What is 10mm Auto based on?
10mm Auto is derived from the .30 Remington case.
What are the best powders for 10mm Auto?
Reloading powders commonly listed for 10mm Auto include Vihtavuori N320, IMR Hi-Skor 800X, CFE Pistol, Vihtavuori N340, among 20 suitable options.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 219 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →