Rifle · SAAMI
.270 WSM
Short-action magnum performance in .270 caliber.
- Caliber
- 0.2772″ · 7.04 mm
- Introduced
- 2002
- Case
- Rebated
- Parent
- .300 WSM
- Primary use
- Hunting
- Status
- Active
- Introduced
- 2002
- Type
- Rifle
- Origin
- United States
- Inventor
- Winchester
- Manufacturer
- Winchester Ammunition
- Standard
- SAAMI
- Status
- Active
- Availability
- Common
- Case capacity
- 79 gr H₂O
- Twist (typical)
- 1:10
- Primer
- Large Rifle Magnum
- Case type
- Rebated
- Max pressure
- 65,000 psi, SAAMI transducer
- Eff. range
- 500 yd
- Max range
- 5100 yd
- Recoil
- 14–18 ft·lb
Introduced by Winchester Ammunition
Ballistics
Published velocity/energy data isn't available for .270 WSM. Parent case: .300 WSM.
Performance
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 ⌀ | 7.04 | 0.277 | ✓ |
| Neck ⌀ | 7.98 | 0.314 | ✓ |
| Shoulder ⌀ | 13.67 | 0.538 | ✓ |
| Shoulder angle | 35° | — | ✓ |
| Base ⌀ | 14.10 | 0.555 | ✓ |
| Rim ⌀ | 13.59 | 0.535 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 7.03 | 0.277 | ≈ |
| 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. .270 WSM is highlighted below.
Factory loads
Being verified
Advertised FPS, energy, and BC are withheld until loads clear verification.
Suitable powders
15 reloading powders listed for .270 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 .270 WSM
Lineage
Connected reference
History
Part of Winchester's WSM family introduced in the early 2000s. Offered .270 Weatherby Magnum-class velocity in a short-action package, theoretically improving accuracy through a stiffer receiver.
FAQs
- What twist rate does .270 WSM use?
- .270 WSM typically uses a 1:10 twist rate.
- What bullet diameter is .270 WSM?
- .270 WSM uses a 0.2772″ (7.04 mm) diameter bullet.
- Is .270 WSM still in production?
- .270 WSM is active; typical availability is common.
- What is .270 WSM used for?
- .270 WSM is primarily used for hunting.
- What is .270 WSM based on?
- .270 WSM is derived from the .300 WSM case.
- What are the best powders for .270 WSM?
- Reloading powders commonly listed for .270 WSM include Alliant Reloader 16, URP, Reloader 17, Norma 204, among 15 suitable options.
Sources & provenance
- Standard SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) — ANSI/SAAMI Z299.4 – 2015 (Centerfire Rifle) — Velocity & Pressure / Cartridge & Chamber Drawings · representative_gun, grain_ballistics archived
- Standard C.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Standard SAAMI — ANSI/SAAMI Z299 — Cartridge & Chamber Drawings archived
- Manufacturer Federal Premium — Power-Shok Rifle 270 WSM 130 Grain (SKU 270WSME) · representative_gun, grain_ballistics archived
- Manufacturer Nosler — Trophy Grade Ammunition — 270 WSM 150gr AccuBond Long Range · representative_gun, grain_ballistics archived
- Manufacturer Nosler — Trophy Grade Ammunition — 270 WSM 140gr AccuBond · grain_ballistics, representative_gun archived
- Manufacturer Remington — Core-Lokt 270 WSM 130 Grain (SKU 29-28940) · representative_gun, grain_ballistics archived
- Manufacturer Norma — Norma Oryx .270 WSM 150 gr (20169322) · representative_gun, grain_ballistics
- Manufacturer Federal Premium — Fusion Rifle 270 WSM 150 Grain (SKU F270WSMFS1) · grain_ballistics, representative_gun archived
- Manufacturer Norma — Norma TIPSTRIKE 270 WSM 140 gr (20169532) · representative_gun, grain_ballistics
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 77 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →
