.270 Winchester Short Magnum
From Wikipedia, the free encyclopedia
| .270 Winchester Short Magnum | ||
|---|---|---|
| Type | Rifle | |
| Place of origin | USA | |
| Production history | ||
| Designer | Winchester | |
| Designed | 2002 | |
| Specifications | ||
| Parent case | .300 WSM | |
| Case type | Rimless, bottleneck | |
| Bullet diameter | .277 in (7.0 mm) | |
| Neck diameter | .3140 in (7.98 mm) | |
| Shoulder diameter | .5381 in (13.67 mm) | |
| Base diameter | .5550 in (14.10 mm) | |
| Rim diameter | .535 in (13.6 mm) | |
| Rim thickness | .054 in (1.4 mm) | |
| Case length | 2.100 in (53.3 mm) | |
| Overall length | 2.860 in (72.6 mm) | |
| Rifling twist | 1-10" | |
| Primer type | Large rifle magnum | |
| Ballistic performance | ||
| Bullet weight/type | Velocity | Energy |
| 90 gr (5.8 g) JHP | 3,700 ft/s (1,100 m/s) | 2,737 ft·lbf (3,711 J) |
| 130 gr (8.4 g) HP | 3,295 ft/s (1,004 m/s) | 3,135 ft·lbf (4,250 J) |
| 140 gr (9.1 g) SP | 3,250 ft/s (990 m/s) | 3,284 ft·lbf (4,453 J) |
| 150 gr (9.7 g) SPBT | 3,136 ft/s (956 m/s) | 3,276 ft·lbf (4,442 J) |
| Test barrel length: 24" Source: "Shooting Times" [1] / Accurate Powder [2] |
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The .270 Winchester Short Magnum or .270 WSM is a short, unbelted, magnum Cartridge (firearms) created by necking down the .300 Winchester Short Magnum and fitting it with a .270 caliber bullet.
Contents |
[edit] Overview
When it was introduced, the .300 WSM sported a new case that showed a lot of promise for uses in other calibers. In 2002 Winchester introduced new cartridges in its Winchester Short Magnum family, including the 7 mm WSM and .270 WSM. This new .270 cartridge was the third commercial .270 ever produced, and the first one in 60 years.[1]
The .270 WSM is an improvement over the older .270 Winchester providing higher velocity with bullets of the same weight, and thus a flatter trajectory and more energy. Velocities tend to be about 250 ft/s (76 m/s) faster, in a cartridge that is shorter and can therefore be used in a shorter action for a more compact rifle if desired.
[edit] Specifications
[edit] See also
[edit] References
- ^ a b Pearce, Lane (October 2007). "Nosler's Model 48 Sporter and the .270 WSM". Shooting Times Volume 48, No. 10: 44–46.
- ^ ".270 WSM reloading data" from Accurate Powder
