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Common uses: Hunting, Big Game, Long Range
| Type | rifle (centerfire) |
| Typical load | 150gr Winchester Super-X Power-Point |
| Muzzle velocity | 3150 fps |
| Muzzle energy | 3306 ft-lb |
| Published G1 ballistic coefficient | 0.344 |
| Case length | 53.34 mm |
| Overall length | 72.64 mm |
| SAAMI max pressure | 65000 PSI |
| Common twist rate | 1:10" |
| Range (yd) | Velocity (fps) | Energy (ft-lb) | Drop (in) |
|---|---|---|---|
| 0 | 3150 | 3304 | -1.5 |
| 100 | 2863 | 2729 | 0 |
| 200 | 2592 | 2238 | -2.8 |
| 300 | 2339 | 1822 | -10.7 |
| 400 | 2100 | 1468 | -25.1 |
| 500 | 1875 | 1170 | -47.4 |
At 1,000 yards, .270 WSM (150gr at 3150 fps, 100 yd zero, standard conditions) has a modeled come-up of about 35.5 MOA / 10.3 MIL, retaining 1080 fps (subsonic).
| Range (yd) | Velocity (fps) | State | Drop (in) | Elev (MOA) | Elev (MIL) |
|---|---|---|---|---|---|
| 300 | 2339 | Supersonic | -10.7 | 3.4 | 0.99 |
| 400 | 2100 | Supersonic | -25.1 | 6.0 | 1.74 |
| 500 | 1875 | Supersonic | -47.4 | 9.1 | 2.63 |
| 600 | 1667 | Supersonic | -79.5 | 12.7 | 3.68 |
| 700 | 1479 | Supersonic | -124.3 | 17.0 | 4.93 |
| 800 | 1315 | Transonic | -185.0 | 22.1 | 6.42 |
| 900 | 1180 | Transonic | -266.0 | 28.2 | 8.21 |
| 1000 | 1080 | Subsonic | -371.9 | 35.5 | 10.33 |
Extended predictions beyond 500 yards are modeled from the same G1 engine — useful for initial DOPE, but outside the 500-yard manufacturer-table validation audit. Confirm with observed DOPE, especially near transonic.
A retained-energy reference only — not a shoot/don't-shoot distance. Real effective range depends on your accuracy, shot placement, bullet construction, and conditions. The ~1,000 ft-lb (deer-sized) and ~1,500 ft-lb (elk-sized) figures are commonly cited rules of thumb, not standards.
Your barrel, ammunition lot, and conditions will differ — always verify against the manufacturer's data and your own rifle.
The .270 WSM is best known as a hard-hitting, flat-shooting open-country cartridge that pushes the same .277 bullets as the classic .270 Winchester at higher velocity, yielding a flatter trajectory and more downrange energy from a shorter case. It is a favorite for deer, pronghorn, sheep, and elk-class game where long shots across canyons and plains are common, and it fits in short-action rifles that can be built lighter and stiffer than long-action alternatives. Recoil is noticeably sharper than the parent .270 Winchester, and the fat, high-pressure case tends to burn barrels faster and can be pickier to feed smoothly than a standard-taper cartridge. Factory ammunition and component bullet selection are narrower than the ubiquitous .270 Winchester, which is the main practical tradeoff hunters weigh. For shooters who want maximum reach and energy from the .277 bore without stepping up to a belted magnum, it remains a capable and respected big-game round.
Winchester introduced the .270 WSM in 2002 as part of its Winchester Short Magnum family, following the .300 WSM that launched the line a year earlier. It was created by necking the short, beltless WSM case down to accept .277-caliber bullets, giving the classic .270 bore diameter a modern short-magnum platform. The design pairs a squat, wide powder column with a sharp 35-degree shoulder to burn propellant efficiently in a case short enough to function in standard-length rifle actions.
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