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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 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 WSM is an improvement over the older 270 Winchester providing higher velocity with bullets of the same weight, and thus a flatter trajectory and more energy. Velocities tend to be about 250 ft/s (76 m/s) faster, in a cartridge that is shorter and can therefore be used in a shorter action resulting in a more compact rifle if desired.
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 Winchester Model 54 is a bolt-action rifle manufactured by the Winchester Repeating Arms Company. The 54 was the first successful production run civilian centerfire bolt action for Winchester. The 54 was the first successful production run civilian centerfire bolt action for Winchester.
The cartridges were produced by the Western Cartridge Company. It was loaded with 150-gr (10 g) bullet, with a muzzle velocity of 3,208 ft/s (978 m/s), and 3,445 ft⋅lbf (4,671 J) of energy. The .35 Newton was a rimless centerfire cartridge introduced in 1915, two years after the .30 Newton, and the cartridges were produced by the Western ...
Most rifle magazines had a capacity for 4 cartridges. The .222 Remington version could hold 5 cartridges and the larger .300 H&H Magnum and other similarly large cartridges were limited to 3 cartridges in the magazine. Barrels were tapered with lengths, depending on year and caliber, ranging from 22 to 26 inches.
The larger action was originally meant for Rigby's interim .400/.350 round, but in 1911 the company introduced the .416 Rigby cartridge for rifles built on the Magnum Mauser action. This was the first magazine rifle that could perform on a par with the powerful Nitro-Express double rifles, for one-third to one-fifth of their prices.