Lindcott Armory Rifle · SAAMI
.300 WSM
Near-.300 Win Mag performance from a short-action rifle.
- Caliber
- 0.308″ · 7.823 mm
- Introduced
- 2001
- Case
- Rebated
- Parent
- .404 Jeffery
- Primary use
- Hunting, Long Range
- Status
- Active
- Introduced
- 2001
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 81 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Rebated
- Max pressure
- 65,000 psi
- Eff. range
- 600 yd
- Max range
- 1400 yd
- Recoil
- 20–28 ft·lb
Ballistics
Real trajectory computed from a representative load — Berger Hunting 215 gr, 2,900 fps, BC 0.354 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2899 | 4012 | -1.5″ | — |
| 100 yd | 2769 | 3660 | 0.0″ | 0.0 |
| 200 yd | 2641 | 3330 | -3.0″ | -1.4 |
| 300 yd | 2516 | 3022 | -11.0″ | -3.5 |
| 400 yd | 2395 | 2738 | -24.5″ | -5.9 |
| 500 yd | 2276 | 2474 | -44.1″ | -8.4 |
| 600 yd | 2161 | 2230 | -70.5″ | -11.2 |
| 700 yd | 2049 | 2004 | -104.2″ | -14.2 |
| 800 yd | 1940 | 1796 | -146.2″ | -17.5 |
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
Buy links open .300 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.
SAAMI · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 7.82 | 0.308 | ✓ |
| Neck ⌀ | 8.74 | 0.344 | ✓ |
| Shoulder ⌀ | 13.67 | 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 | 7.57 | 0.298 | ≈ |
| 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. .300 WSM is highlighted below.
Factory loads
In production — 329 active loads across 31 brands. Top 15 shown · see all 329 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Hornady | Superformance SST | 150 | SST | 3,400 | 3,850 | 0.257 G7 |
| Barnes | VOR-TX | 150 | TTSX BT | 3,300 | 3,626 | 0.198 G7 |
| Barnes | VOR-TX TTSX BT | 165 | TTSX BT | 3,130 | 3,589 | 0.216 G7 |
| Hornady | Superformance SST | 165 | SST | 3,130 | 3,589 | 0.244 G7 |
| Hornady | InterBond | 165 | InterBond Bonded SP | 3,130 | 3,589 | 0.447 G1 |
| Barnes | VOR-TX | 165 | TTSX BT | 3,100 | 3,520 | 0.216 G7 |
| Norma | BondStrike | 180 | BondStrike Bonded Polymer Tip | 3,051 | 3,720 | 0.615 G1 |
| Hornady | Superformance | 180 | SST | 3,010 | 3,621 | 0.259 G7 |
| Hornady | Precision Hunter ELD-X | 178 | ELD-X | 3,010 | 3,580 | 0.287 G7 |
| Hornady | Superformance SST | 180 | SST | 3,010 | 3,621 | 0.259 G7 |
| Hornady | Match ELD-M | 195 | ELD-M | 3,000 | 3,896 | 0.318 G7 |
| Nosler | Trophy Grade AccuBond | 180 | AccuBond | 2,975 | 3,537 | 0.259 G7 |
| Norma | American PH AccuBond | 180 | Nosler AccuBond | 2,975 | 3,537 | 0.259 G7 |
| Nosler | Trophy Grade | 180 | AccuBond | 2,970 | 3,525 | 0.259 G7 |
| Winchester | Expedition Big Game | 180 | Nosler AccuBond | 2,970 | 3,525 | 0.259 G7 |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
17 reloading powders listed for .300 WSM, fastest to slowest. Cross-reference in the finder →
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 .300 WSM
12 models in the database chamber .300 WSM. Browse all →
Lineage
Connected reference
History
Introduced by Winchester in 2001 as the first WSM. Achieves approximately 95% of .300 Win Mag velocity in a short action. Adopted for some precision rifle applications.
FAQs
- What twist rate does .300 WSM use?
- .300 WSM typically uses a 1:10 twist rate.
- What bullet diameter is .300 WSM?
- .300 WSM uses a 0.308″ (7.823 mm) diameter bullet.
- Is .300 WSM still in production?
- .300 WSM is active; typical availability is common.
- What is .300 WSM used for?
- .300 WSM is primarily used for hunting, long range.
- What is .300 WSM based on?
- .300 WSM is derived from the .404 Jeffery case.
- What are the best powders for .300 WSM?
- Reloading powders commonly listed for .300 WSM include Alliant Reloader 16, Reloader 17, IMR 4955, Norma 204, among 17 suitable options.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 329 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →