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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 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 rimless cartridge has a base diameter of 11.3 mm (like the Russian 7.62×39mm) and a case length of 46 mm. [2] The bullet is a standard .270/.277 caliber bullet with a light 100 gr weight with a muzzle velocity of 840 m/s (2,800 ft/s), similar in performance to the later 6.8mm Remington SPC. It was not good at long range, but its slender ...
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".
The 270 gr (17 g) spitzer bullet at .375 H&H velocities has a Maximum point-blank range (MPBR) of about 260 yd (240 m) when sighted in at about 220 yd (200 m). The typical 300 gr (19 g) ammunition manufactured by Federal and Remington have a muzzle velocity of 2,530 feet per second (770 m/s) churning out 4,263 ft⋅lbf (5,780 J) of energy.
The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.
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 .276 Enfield was designed with the intent of being more powerful than the .303 British cartridge used in the Lee–Enfield rifles and to be at least similar in size and performance to other large, powerful early 20th century military rifle cartridges, like the .280 Ross, 7.92×57mm Mauser, .30-06 Springfield and 7.5×55mm Swiss GP11.