.270 Winchester Short Magnum

Infobox Firearm Cartridge
name= .270 Winchester Short Magnum


caption=
origin= USA
type= Rifle
designer= Winchester
design_date=2002
manufacturer=
production_date=
number=
variants=
is_SI_specs=
parent=.300 WSM
case_type=Rimless, bottleneck
bullet=.277
neck=.3140
shoulder=.5381
base=.5550
rim_dia=.535
rim_thick=.054
case_length=2.100
length=2.860
rifling=1-10"
primer=Large rifle magnum
is_SI_ballistics=
bw1=90
btype1=JHP
vel1=3700
en1=2737
bw2=130
btype2=HP
vel2=3295
en2=3135
bw3=140
btype3=SP
vel3=3250
en3=3284
bw4=150
btype4=SPBT
vel4=3136
en4=3276
bw5=
btype5=
vel5=
en5=
test_barrel_length=24"
balsrc= "Shooting Times" cite journal | last = Pearce | first = Lane | title = Nosler's Model 48 Sporter and the .270 WSM | journal = Shooting Times | volume = Volume 48, No. 10 | pages = 44–46 | date = October 2007 | url =http://www.shootingtimes.com ] / Accurate Powder " [http://www.accuratepowder.com/data/PerCaliber2Guide/Rifle/Standarddata(Rifle)/277Cal(7.03mm)/270%20WSM%20Jul%202004%20.pdf .270 WSM reloading data] " from Accurate Powder] 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.

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.

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 convert|250|ft/s|m/s|abbr=on faster, in a cartridge that is shorter and can therefore be used ina shorter action for a more compact rifle if desired.

pecifications

* SAAMI maximum average pressure: 65,000 PSI

ee also

* List of rifle cartridges
* 7 mm caliber
* 6.8 mm SPC
* Delta L problem

References