10mm Auto
The powerhouse auto-pistol cartridge. Originally developed for the FBI. Full-power loads rival .357 Magnum for hunting and wilderness defense. Excellent for deer and hog hunting from a semi-auto platform. Gaining popularity with the resurgence of 10mm pistols from Glock, SIG, and Smith & Wesson.
Best For
Ballistics (Typical Factory Load)
🔧 Handloading Data
Reference load data for experienced reloaders. Always start at the start charge and work up. Consult official manuals before loading.
| Bullet | Powder | Start | Max | Velocity | COAL | Source |
|---|---|---|---|---|---|---|
| 155 gr (10.0 g) JHP | Hodgdon Longshot | 8.5 gr 0.55 g |
9.5 gr 0.62 g |
1,250 fps | 1.260 | Hodgdon |
| 155 gr (10.0 g) JHP | Alliant Power Pistol | 9.8 gr 0.64 g |
11.0 gr 0.71 g |
1,280 fps | 1.260 | Alliant |
| 180 gr (11.7 g) JHP | Hodgdon CFE Pistol | 6.8 gr 0.44 g |
7.6 gr 0.49 g |
1,070 fps | 1.260 | Hodgdon |
| 180 gr (11.7 g) JHP | Alliant Power Pistol | 8.5 gr 0.55 g |
9.5 gr 0.62 g |
1,150 fps | 1.260 | Alliant |
| 200 gr (13.0 g) FMJ | Hodgdon Titegroup | 5.0 gr 0.32 g |
5.7 gr 0.37 g |
950 fps | 1.260 | Hodgdon |
| 200 gr (13.0 g) FMJ | Alliant Blue Dot | 9.5 gr 0.62 g |
11.0 gr 0.71 g |
1,050 fps | 1.260 | Alliant |
📐 Measurement Guide for Reloaders
Measured in grains (1 grain ≈ 0.065 grams) using precision digital or mechanical scales. Maintaining strict powder weight is crucial for safety and velocity consistency.
Total length from case base to bullet tip. Checked with digital calipers. Must be within manufacturer's specified range to fit and feed from your firearm's magazine.
Precision shooters measure to the ogive — the curved part of the bullet that first contacts the rifling — for more accurate bullet seating depth and consistency.
Brass stretches with firing. Measure case length to know when to trim. Use headspace comparators to check shoulder bump-back during sizing.
The grip the brass has on the bullet. Measured with ball micrometers by comparing neck wall thickness before and after bullet seating.
Inspect fired brass for over-pressure: flattened primers, ejector marks, case head expansion. If unsure, reduce charge and consult your load manual.
⚠️ Always consult established reloading manuals (Hodgdon, Hornady, Lyman) for your specific bullet and powder combinations. For experienced reloaders only.
Technical Specifications
| Bullet Diameter | 10.16 mm |
| Case Length | 25.07 mm |
| Max Chamber Pressure | 37,500 PSI |
| Type | Pistol |