Pistol · SAAMI (not in current Z299)
9mm Winchester Magnum
High-pressure semi-auto pistol magnum delivering 9mm bullets at .357 Magnum velocities.
- Caliber
- 0.355″ · 9.017 mm
- Introduced
- 1977
- Case
- Rimless
- Parent
- 9mm Luger
- Primary use
- Hunting, Self Defense
- Status
- Discontinued
- Introduced
- 1977
- Type
- Pistol
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester Ammunition
- Standard
- SAAMI (not in current Z299)
- Status
- Discontinued
- Availability
- Collector
- Case capacity
- 24.5 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Small Pistol
- Case type
- Rimless
- Max pressure
- 45,000 psi, SAAMI transducer
- Eff. range
- 100 yd
- Max range
- 2500 yd
- Recoil
- 8.9–9.4 ft·lb
- Subsonic
- Capable
Introduced by Winchester Ammunition
Ballistics
Published velocity/energy data isn't available for 9mm Winchester Magnum — an obsolete/collector cartridge. Parent case: 9mm Luger.
Performance
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
SAAMI · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 9.02 | 0.355 | ✓ |
| Neck ⌀ | 9.63 | 0.379 | ✓ |
| Shoulder ⌀ | n/a | ||
| Shoulder angle | n/a | ||
| Base ⌀ | 9.93 | 0.391 | ✓ |
| Rim ⌀ | 10.01 | 0.394 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.27 | 0.050 | ✓ |
| Neck length | n/a | ||
| Case length | 29.46 | 1.160 | ✓ |
| Overall length | 40.01 | 1.575 | ✓ |
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. 9mm Winchester Magnum 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.
Firearms chambered in 9mm Winchester Magnum
Lineage
History
Introduced in 1977 by Winchester for the Wildey semi-automatic pistol, a large gas-operated pistol designed by James Wildey. The cartridge offered genuine magnum performance from a semi-automatic platform. The Wildey pistol gained cult recognition through Charles Bronson's 1985 film 'Death Wish 3' despite limited commercial sales. Winchester discontinued factory ammunition in the 1990s.
FAQs
- What twist rate does 9mm Winchester Magnum use?
- 9mm Winchester Magnum typically uses a 1:10 twist rate.
- What bullet diameter is 9mm Winchester Magnum?
- 9mm Winchester Magnum uses a 0.355″ (9.017 mm) diameter bullet.
- Is 9mm Winchester Magnum still in production?
- 9mm Winchester Magnum is discontinued; typical availability is collector.
- What is 9mm Winchester Magnum used for?
- 9mm Winchester Magnum is primarily used for hunting, self defense.
- What is 9mm Winchester Magnum based on?
- 9mm Winchester Magnum is derived from the 9mm Luger case.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 15 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
