.270 Winchester Short Magnum
| 270 Winchester Short Magnum | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
270 WSM cartridge | ||||||||||||||||||||
| Type | Rifle | |||||||||||||||||||
| Place of origin | USA | |||||||||||||||||||
| Production history | ||||||||||||||||||||
| Designer | Winchester | |||||||||||||||||||
| Designed | 2002 | |||||||||||||||||||
| Produced | 2002–present | |||||||||||||||||||
| Specifications | ||||||||||||||||||||
| Parent case | .300 WSM | |||||||||||||||||||
| Case type | Rimless, bottleneck | |||||||||||||||||||
| Bullet diameter | .277 in (7.0 mm) | |||||||||||||||||||
| Land diameter | .270 in (6.9 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 | |||||||||||||||||||
| Maximum pressure (SAAMI) | 65,000 psi (450 MPa) | |||||||||||||||||||
| Maximum pressure (C.I.P.) | 63,817 psi (440.00 MPa) | |||||||||||||||||||
| Ballistic performance | ||||||||||||||||||||
| ||||||||||||||||||||
| Test barrel length: 24" Source(s): "Shooting Times" / Accurate Powder | ||||||||||||||||||||
The 270 Winchester Short Magnum or 270 WSM is a short magnum cartridge created by necking down the .300 Winchester Short Magnum and fitting it with a .277 caliber bullet. The correct name for the cartridge, as listed by the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI), is 270 WSM, without a decimal point. It is a member of the Winchester Short Magnum family of cartridges.