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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 ]
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.
Particularly, the .270 Wby Mag the result of necked down to accommodate the .277 in bullets and bringing down the case to fit a standard length action. [3] Like most Weatherby cartridges, the .270 Weatherby was standardized by the Small Arms and Ammunitions Manufacturers Institute in 1994, and it has a SAAMI maximum pressure limit of 62,500 psi.
(or 6.5mm/06) - necked down to accept a 6.5 mm bullet - The 6.5-06 offers ballistic performance between the commercialized 25-06 Remington and 270 Winchester with distinct advantages over both in particular long-range applications through a wide selection of bullets with high ballistic coefficients producing better extended range performance.
It was available in a number of loadings with bullets weighing from 270 to 365 grains (17.5 to 23.7 g), all driven by 120 grains (7.8 g) of black powder. [1] [3] The .450 Nitro for Black is the same cartridge loaded with mild loadings of modern smokeless powder, carefully balanced through trial to replicate the ballistics of the black powder ...
The .270 ICL is an improved .264 Winchester Magnum necked up to .270. It's a relatively efficient cartridge for its class. Performance with a 130-grain (8.4 g) bullet is approximately 3,405 ft/s (1,038 m/s) and with a 150-grain (9.7 g) bullet is approximately 3,250 ft/s (990 m/s). [18]
The bullets consist of a fairly normal hollow-point bullet with the frontal cavity filled in by hard plastic, which is molded into a streamlined shape.Most tips are made of polyoxymethylene, although some manufacturers have used polyester urethane-methylenebis(phenylisocyanate) copolymer.
Ammunition is handloaded, using modified parent cases and the gunsmith-provided wildcat dies. Generally, the supplier of the barrel or dies will also provide the buyer with basic reloading data, giving a variety of powders, charge weights, and bullet weights that can be used for developing loads.