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Lindcott Armory

Rifle · SAAMI

7mm WSM

Also known as 7mm Winchester Short Magnum

The 7mm option in Winchester's short magnum family.

Caliber
0.284″ · 7.214 mm
Introduced
2001
Case
Rebated
Parent
.404 Jeffery
Primary use
Hunting, Long Range
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains140 · 150 · 160 gr
Identity
Introduced
2001
Type
Rifle
Origin
United States
Inventor
Winchester
Manufacturer
Winchester Ammunition
Standard
SAAMI
Status
Active
Availability
Common
Build
Case capacity
88 gr H₂O
Twist (typical)
1:9.5
Primer
Large Rifle Magnum
Case type
Rebated
Pressure & range
Max pressure
65,000 psi
Eff. range
700 yd
Max range
1400 yd
Recoil
18–26 ft·lb

Introduced by Winchester Ammunition

Ballistics

Published velocity/energy data isn't available for 7mm WSM. Parent case: .404 Jeffery.

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 ⌀ 7.210.284 ✓
Neck ⌀ 8.150.321 ✓
Shoulder ⌀ 13.660.538 ✓
Shoulder angle 35°— ✓
Base ⌀ 14.120.556 ✓
Rim ⌀ 13.590.535 ✓
Belt ⌀ n/a
Rim thickness 1.370.054 ✓
Neck length 6.170.243 ≈
Case length 53.342.100 ✓
Overall length 72.642.860 ✓

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. 7mm WSM is highlighted below.

Factory loads

Verification

Being verified

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

Suitable powders

12 reloading powders listed for 7mm WSM, fastest to slowest. Cross-reference in the finder →

N550Reloader 17N560Vihtavuori N150Reloader 19H4831Vihtavuori N160IMR 4831AR 2213SCN165N565AR 2217
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 7mm WSM

12 models in the database chamber 7mm WSM. Browse all →

Mossberg Patriot Synthetic 270 WSMBrowning X-Bolt Pro 270 WSMKimber 8400 Montana .325 WSMKimber 8400 Classic .325 WSMRemington Remington 700 SPS 270 WSMWinchester Repeating Arms Model 70 Featherweight 7mm WSM 22-inchKimber Mountain Ascent 325 WSMBrowning BAR ShortTrac 7mm WSMKimber 8400 SuperAmerica 7mm WSMKimber 8400 Classic 7mm WSMKimber 8400 Montana 300 WSM StainlessKimber 8400 Classic 270 WSM

Lineage

Immediate parent
.404 Jeffery
Family TreeOpen 7mm WSM in the interactive cartridge family tree

Connected reference

Loads15 factory loads for 7mm WSMReloading12 suitable powders — cross-referenceFirearmsFirearms in 7mm WSM

History

Part of Winchester's early 2000s WSM initiative. Offers 7mm Rem Mag performance in a short-action rifle. The short, fat case theory held that a stubby case with a large powder column burned more consistently than a long, slender case — resulting in better standard deviations and accuracy.

FAQs

What twist rate does 7mm WSM use?
7mm WSM typically uses a 1:9.5 twist rate.
What bullet diameter is 7mm WSM?
7mm WSM uses a 0.284″ (7.214 mm) diameter bullet.
Is 7mm WSM still in production?
7mm WSM is active; typical availability is common.
What is 7mm WSM used for?
7mm WSM is primarily used for hunting, long range.
What is 7mm WSM based on?
7mm WSM is derived from the .404 Jeffery case.
What are the best powders for 7mm WSM?
Reloading powders commonly listed for 7mm WSM include N550, Reloader 17, N560, Vihtavuori N150, among 12 suitable options.

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 →