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.[3] It is a member of the Winchester Short Magnum family of cartridges.
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 resulting in a more compact rifle if desired.
PerformanceEdit
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 .300 WSM closely mimics the long-popular .300 Winchester Magnum, while the 7mm WSM matches performance of the 7mm Remington Magnum in similar barrel lengths. The .325 WSM is in a league of its own in North America as the 8 mm caliber has not become commonplace.[4]
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.
winchester, short, magnum, winchester, short, magnum, short, magnum, cartridge, created, necking, down, winchester, short, magnum, fitting, with, caliber, bullet, correct, name, cartridge, listed, sporting, arms, ammunition, manufacturers, institute, saami, wi. 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 3 It is a member of the Winchester Short Magnum family of cartridges 270 Winchester Short Magnum270 WSM cartridgeTypeRiflePlace of originUSAProduction historyDesignerWinchesterDesigned2002Produced2002 presentSpecificationsParent case 300 WSMCase typeRimless bottleneckBullet 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 length2 100 in 53 3 mm Overall length2 860 in 72 6 mm Rifling twist1 10 Primer typeLarge rifle magnumMaximum pressure65 000 psi 450 MPa Ballistic performanceBullet mass type Velocity Energy90 gr 6 g JHP 3 700 ft s 1 100 m s 2 737 ft lbf 3 711 J 130 gr 8 g HP 3 295 ft s 1 004 m s 3 135 ft lbf 4 250 J 140 gr 9 g SP 3 250 ft s 990 m s 3 284 ft lbf 4 453 J 150 gr 10 g SPBT 3 136 ft s 956 m s 3 276 ft lbf 4 442 J Test barrel length 24 Source s Shooting Times 1 Accurate Powder 2 Contents 1 Overview 2 Performance 3 See also 4 References 5 External linksOverview Edit nbsp 270 WSM left 270 Win on the rightWhen 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 resulting in a more compact rifle if desired Performance EditThe 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 300 WSM closely mimics the long popular 300 Winchester Magnum while the 7mm WSM matches performance of the 7mm Remington Magnum in similar barrel lengths The 325 WSM is in a league of its own in North America as the 8 mm caliber has not become commonplace 4 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 EditList of rifle cartridges Table of handgun and rifle cartridges 7 mm caliber 6 8 Western Delta L problemReferences Edit 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 EditThe 270 WSM by Chuck Hawks 270 WSM Accuracy in Browning X Bolt Archived 2011 11 18 at the Wayback Machine nbsp This ammunition related article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title 270 Winchester Short Magnum amp oldid 1168948492, wikipedia, wiki, book, books, library,
