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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 ]
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]
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 300 WSM was the first of the new class of short magnums to see wide use. All of the WSM cartridges released to date have proven popular for thin-skinned game up to the size of elk and African plains game, the .325 WSM being an excellent cartridge for elk, bison and similar big game. The cartridges in this family are, in order of development:
.25-06 Remington.25-20 Winchester.25-35 Winchester.25-45 Sharps.297/250 Rook.250-3000 Savage.255 Jeffery Rook.256 Gibbs Magnum.256 Newton.256 Winchester Magnum.257 Roberts.257 Weatherby Magnum.26 Nosler.260 Remington.264 LBC-AR.264 Winchester Magnum.270 Weatherby Magnum.270 Winchester.270 Winchester Short Magnum.275 H&H Magnum.275 No 2 Magnum
The .325 WSM is an efficient, flat shooting 8mm magnum rifle cartridge. Bullet weights range from 125 to 250 gr (8.1 to 16.2 g). Performance is on par with the two other magnum cartridges: 8mm Remington Magnum and the German 8×68mmS cartridge with lighter weight bullets. However, these later two cartridges have a distinct edge of being able to ...
The 7mm WSM is similar to the .300 WSM with the case necked down to handle .284" bullets. However, the distance from the case head to the datum line on the shoulder is longer for the 7WSM, preventing accidental chambering or firing of the .284" 7mm bullet in .270 WSM's .277" bore.
The .270 Weatherby Magnum was the first belted magnum based on the .300 H&H Magnum to be developed by Roy Weatherby in 1943. [2] The cartridge is short enough to function in standard-length long actions with a brass length of 2.549" or 64.74mm and an overall length of about 3.295".