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 Reloader 17, Reloader 19, H4831, AR 2213SC, among 7 suitable options.

Rifle · SAAMI

7mm WSM

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

Velocity3,000–3,250 fps

Energy2,799–3,666 ft·lb

Typical grains140 · 150 · 160 gr

Identity

Introduced: 2001
Type: Rifle
Origin: United States
Inventor: Winchester
Manufacturer: Winchester
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

Ballistics

Real trajectory computed from a representative load — Hornady Superformance SST 140 gr, 3,225 fps, BC 0.275 G7 · 100 yd zero.

Compare tooverlay up to 2

Range	Velocity	Energy	Drop (in)	Drop (MOA)
0 yd	3224	3231	-1.5″	—
100 yd	3047	2886	0.0″	0.0
200 yd	2875	2569	-2.3″	-1.1
300 yd	2708	2279	-8.7″	-2.8
400 yd	2546	2015	-19.9″	-4.8
500 yd	2389	1774	-36.5″	-7.0
600 yd	2238	1556	-59.2″	-9.4
700 yd	2091	1360	-88.8″	-12.1
800 yd	1950	1182	-126.4″	-15.1
900 yd	1812	1021	-173.3″	-18.4
1000 yd	1680	877	-230.5″	-22.0

Point-mass G7/G1 drag model, standard atmosphere — within ~2% of reference solvers to 1000 yd; real barrels and conditions vary. Open in Ballistic Compare →

Performance

Best for HuntingHornady Superformance SST140 gr · SST · 3,225 fps · BC 0.275 G7Buy now →

Best for TargetPPU Rifle140 gr · FMJ · 3,200 fpsBuy now →

Buy links open 7mm WSM ammunition at Rivertown Munitions.

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

Measure	mm	in	✓
Bullet ⌀	7.21	0.284	✓
Neck ⌀	8.15	0.321	✓
Shoulder ⌀	13.66	0.538	✓
Shoulder angle	35°	—	✓
Base ⌀	14.12	0.556	✓
Rim ⌀	13.59	0.535	✓
Belt ⌀	n/a
Rim thickness	1.37	0.054	✓
Neck length	6.17	0.243	≈
Case length	53.34	2.100	✓
Overall length	72.64	2.860	✓

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

In production — 15 active loads across 9 brands. Top 15 shown.

Brand	Load	Grain	Bullet	FPS	ft·lb	BC
Hornady	Superformance SST	140	SST	3,225	3,233	0.275 G7
Browning	BXR	134	BXR RapidExpansion	3,300	3,240	—
Browning	Long Range Pro Hunter	139	Sierra Tipped SP	3,250	3,259	—
Black Hills	Gold	140	AccuBond	3,250	3,283	—
Remington	Core-Lokt	140	Core-Lokt PSP	3,250	3,283	—
Winchester	Power Point SP	140	Power Point SP	3,225	3,233	—
Barnes	VOR-TX TTSX BT	140	TTSX BT	3,225	3,233	—
PPU	Rifle	140	FMJ	3,200	3,183	—
Federal	Power-Shok SP	150	SP	3,100	3,200	—
Nosler	Trophy Grade AccuBond	150	AccuBond	3,100	3,200	—
Federal	Fusion SP	150	Fusion SP	3,100	3,200	—
Remington	Premier	160	Nosler Partition	3,100	3,414	—
Winchester	Power Point SP	160	Power Point SP	3,050	3,304	—
PPU	Rifle	150	SP	3,050	3,098	—
Black Hills	Match	168	Berger Hybrid	3,000	3,357	—

Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.

Suitable powders

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

Reloader 17 Reloader 19 H4831 AR 2213SC IMR 4831 AR 2217 N565

Reloading costestimate cost per round vs factory

Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.

Powder $/lbCharge (gr)Bullet $/eaPrimer $/eaBrass reusesBrass $/ea

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 →

Browning X-Bolt Pro 270 WSMKimber 8400 Montana .325 WSMKimber 8400 Classic .325 WSMRemington Remington 700 SPS 270 WSMHowa Howa 1500 Standard 7mm WSMHowa Howa 1500 Standard 300 WSMKimber 8400 SuperAmerica 270 WSMKimber 8400 Montana 270 WSMKimber 8400 SuperAmerica 7mm WSMWinchester Model 70 Extreme Weather SS 7mm WSMKimber 8400 Montana 7mm WSMKimber 8400 SuperAmerica 300 WSM

Lineage

Immediate parent

.404 Jeffery

Family TreeOpen 7mm WSM in the interactive cartridge family tree↗

Connected reference

Loads15 factory loads for 7mm WSM↗Reloading7 suitable powders — cross-reference↗FirearmsFirearms in 7mm WSM↗ToolCompare ballistics↗

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 Reloader 17, Reloader 19, H4831, AR 2213SC, among 7 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 →