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Lindcott Armory

Rifle · SAAMI

.325 WSM

Also known as .325 Winchester Short Magnum · 8mm WSM · 8.2x53mm

Winchester's 8mm entry in the Short Magnum family — a powerful, compact round delivering near-.338 Win Mag performance in a short-action cartridge.

Caliber
0.323″ · 8.204 mm
Introduced
2005
Case
Rebated
Parent
.300 WSM
Primary use
Hunting
Status
Active

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VelocityBeing verified
EnergyBeing verified
Typical grains180 · 200 gr
Identity
Introduced
2005
Type
Rifle
Origin
United States
Inventor
Winchester
Manufacturer
Winchester Ammunition
Standard
SAAMI
Status
Active
Availability
Limited
Build
Case capacity
89 gr H₂O
Twist (typical)
1:10
Primer
Large Rifle
Case type
Rebated
Pressure & range
Max pressure
65,000 psi
Eff. range
400 yd
Max range
900 yd
Recoil
20–30 ft·lb

Introduced by Winchester Ammunition

Ballistics

Published velocity/energy data isn't available for .325 WSM. Parent case: .300 WSM (expanded).

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 ⌀ 8.200.323 ✓
Neck ⌀ 8.890.350 ✓
Shoulder ⌀ 13.660.538 ✓
Shoulder angle 35°— ✓
Base ⌀ 14.100.555 ✓
Rim ⌀ 13.590.535 ✓
Belt ⌀ n/a
Rim thickness 1.370.054 ✓
Neck length 7.820.308 ≈
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. .325 WSM is highlighted below.

Factory loads

Verification

Being verified

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

Suitable powders

1 reloading powder listed for .325 WSM, fastest to slowest. Cross-reference in the finder →

Reloader 19
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 .325 WSM

12 models in the database chamber .325 WSM. Browse all →

Browning X-Bolt Hell's Canyon Speed .300 WSM 23-inchBrowning X-Bolt White Gold .270 WSMBrowning X-Bolt Hunter .270 WSM 23-inchKimber 8400 Montana .325 WSMKimber 8400 Classic .325 WSMBrowning BLR Lightweight '81 .325 WSMKimber 8400 SuperAmerica .300 Win MagKimber Montana 308 WinKimber Mountain Ascent 325 WSMKimber 8400 Classic 7mm WSMKimber 8400 Montana 300 WSM StainlessKimber 8400 Classic 270 WSM

Lineage

Immediate parent
.300 WSM
Family TreeOpen .325 WSM in the interactive cartridge family tree

Connected reference

Reloading1 suitable powder — cross-referenceFirearmsFirearms in .325 WSM

History

Introduced in 2005 as the last addition to Winchester's WSM family. The .325 WSM was designed to give hunters .338-class performance in a short-action rifle. Factory ammunition from Winchester and Nosler remains available, though selection is limited compared to more popular WSM cartridges. The Winchester Model 70 is the primary platform.

FAQs

What twist rate does .325 WSM use?
.325 WSM typically uses a 1:10 twist rate.
What bullet diameter is .325 WSM?
.325 WSM uses a 0.323″ (8.204 mm) diameter bullet.
Is .325 WSM still in production?
.325 WSM is active; typical availability is limited.
What is .325 WSM used for?
.325 WSM is primarily used for hunting.
What is .325 WSM based on?
.325 WSM is derived from the .300 WSM (expanded) case.
What are the best powders for .325 WSM?
Reloading powders commonly listed for .325 WSM include Reloader 19.

Sources & provenance

Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 12 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →