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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 ]
.17 Hornady Mach 2.17 Hornady Magnum Rimfire.17 Winchester Super Magnum.22 BB Cap.22 CB Cap.22 Short.22 Long.22 Long Rifle.22 Extra Long.22 Remington Automatic.22 Winchester Automatic.22 ILARCO.22 Winchester Rimfire.22 Winchester Magnum Rimfire.25 Stevens.25 Stevens Short.32 rimfire.38 rimfire.44 Henry.46 rimfire.56-46 Spencer.56-50 Spencer
WSM and WSSM family of cartridges. From left to right: .223 WSSM, .243 WSSM, .25 WSSM, .270 WSM, 7 mm WSM, .300 WSM, .325 WSM. Winchester Super Short Magnum, or WSSM is a line of rebated bottlenecked centerfire short magnum cartridges introduced by the U.S. Repeating Arms Company (Winchester Inc). [1]
However, on the contrary to what some competitive shooters and sportsman believe, and as mentioned above, for reloaders there are quite an array of bullet sizes and shapes to choose from. Bullet weights from 125 gr to 250 gr are offered by premium bullet makers such as Nosler, Sierra, Barnes, Woodleigh, Swift, Hornady and other major manufactures.
A magnum cartridge is a firearm cartridge with a larger case size than, or derived from, a similar cartridge of the same projectile caliber and case shoulder shape. [clarification needed] The term derives from the .357 Magnum, the original revolver cartridge with this designation.
The .270 Winchester is a rifle cartridge developed by Winchester Repeating Arms Company in 1923, and it was unveiled in 1925 as a chambering for their bolt-action Model 54 [3] to become arguably the flattest shooting cartridge of its day, only competing with the .300 Holland & Holland Magnum, also introduced in the same year.
The original Hornady loads were not Superformance, but had the same velocity, with the Superformance loading offering lower recoil due to a smaller propellant charge, and less steep pressure curve. The Double Tap achieves 2,825 ft/s (861 m/s) and 4,700 ft⋅lb (6,400 J) with a 270-grain Barnes TSX from a 23-inch barrel Ruger 77 African.
Hornady's 225 gr (14.6 g) SST Superformance load has muzzle energy of 4,029 ft⋅lbf (5,463 J) @ 2840fps. It maintains 2,025 ft⋅lbf (2,746 J) @ 2014fps @ 500 meters. This is from a 24" test barrel as compared to 27.5" test barrel for a 338 Lapua.