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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 ]
Values courtesy of the Hornady Ballistic Calculator [14] For the purposes of this comparison barrel a barrel length of 24 in (610 mm) is used. The .458 Lott is able to attain over 2,300-foot-per-second (700 m/s) with a 500-grain (32 g) jacketed bullet at safe pressure levels from a 23–24-inch (580–610 mm) barrel.
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.
Factory loadings. Number of manufacturers producing complete cartridges - e.g. Norma, RWS, Hornady, Winchester, Federal, Remington, Sellier & Bellot, Prvi Partizan. May be none for obsolete and wildcat cartridges. H/R: Handgun (H) or rifle (R) - dominant usage of the cartridge (although several dual-purpose cartridges exist)
The American ammunition manufacturer Hornady got the 300 Precision Rifle Cartridge [15] SAAMI-standardized in 2018. [ 16 ] [ 17 ] In 2019 it got C.I.P. -standardized as the 300 PRC. [ 18 ] The .375 Ruger cartridge has functioned as the parent case for the .300 Precision Rifle Cartridge (300 PRC), [ 19 ] which is essentially a necked-down ...
The Hornady Superformance ammunition drives a 270-grain (17 g) SP-RP bullet at 2,840 ft/s (870 m/s) and the 300-grain (19 g) DGS and DGX bullets at 2,660 ft/s (810 m/s). 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 ...
For example, if we compare the .25 WSSM to the .25-06 Remington, we find that the .25-06 requires a .30-06 length action, commonly called a standard or long action. The .25 WSSM case which is almost a full inch shorter, can make use of an existing short action such as used by the 5.56 NATO and .223 Remington family of cartridges.
The Hornady Superformance Ammunition drives a Hornady 180 gr (12 g) Interbond or SST bullet at 3,040 ft/s (930 m/s) and the 150 gr (9.7 g) SST bullets at 3,310 ft/s (1,010 m/s). The.300 Ruger Compact Magnum's greater case capacity, and the "short fat" cartridge efficiency lead to increases in the neighborhood of 150 fps over the H&H cartridge ...