.270 Winchester Short Magnum
| 270 Winchester Short Magnum | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
.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 | ||||||||||||||||||||
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| Test barrel length: 24" Source(s): "Shooting Times" [1] / Accurate Powder [2] | ||||||||||||||||||||
The 270 Winchester Short Magnum or 270 WSM is a short magnum
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
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 resulting in a more compact rifle if desired.
Performance
The .270 WSM is the only cartridge of the WSM family that produces notable ballistic gains over other existing cartridges. It is the best performing short action on the market. The
The .270 WSM comes quite close in performance to that of the legendary .270 Weatherby Magnum, with notable differences being that the .270 WSM is chambered in a short action and normally utilizes a 24" barrel whereas the older Weatherby cartridge utilizes a long action and is most commonly paired with a 26" barrel.[citation needed] The .270 Weatherby has a belt and the .270 WSM does not.
See also
- List of rifle cartridges
- Table of handgun and rifle cartridges
- 7 mm caliber
- 6.8 Western
- Delta L problem
References
- ^ a b Pearce, Lane (October 2007). "Nosler's Model 48 Sporter and the .270 WSM". Shooting Times. 48 (10): 44–46.
- ^ "270 WSM reloading data Archived 2007-09-30 at the Wayback Machine" from Accurate Powder
- ^ Sporting Arms and Ammunition Manufacturers' Institute Archived July 13, 2008, at the Wayback Machine
- ^ "Short Magnums".
External links
- The 270 WSM by Chuck Hawks
- 270 WSM Accuracy in Browning X-Bolt Archived 2011-11-18 at the Wayback Machine
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