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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.
This new .270 cartridge was the third commercial .270 ever produced, and the first one in 60 years. [1] 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 ...
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.
A guide to the recoil from the cartridge, and an indicator of bullet penetration potential. The .30-06 Springfield (at 2.064 lbf-s) is considered the upper limit for tolerable recoil for inexperienced rifle shooters. [2] Chg: Propellant charge, in grains; Dia: Bullet diameter, in inches; BC: Ballistic coefficient, G1 model; L: Case length (mm)
Comparison of trajectories of the .30-06 Springfield, .270 Winchester and the .257 Weatherby Magnum. The .257 Weatherby is known for its long range performance and is considered an accurate flat shooting cartridge. Initially due to the cartridge's high velocity the cartridge exhibits less bullet drop than most other cartridges.
It uses .257 caliber bullets (6.5 mm), and popular bullet weights are between 75 and 117 gr. This cartridge also uses the abundant 5.56 case as its parent, for affordable re-loading. There is no benefit to loading this cartridge to subsonic velocities, so all loadings are directed at improving impact when using light-weight high-velocity bullets.
Other bullet manufacturers like Lapua and Nosler also published the G1 and G7 BCs for most of their target bullets. [ 63 ] [ 64 ] Many of these manufacturer and other independently verified G1 and G7 Ballistic Coefficients for most of the modern bullets gets published and updated regularly in freely published bullet database. [ 65 ]
Suitable .358 in (9.1 mm) bullets range in weight from 150 to 300 grains (9.7 to 19.4 g). Using a 250-grain (16 g) bullet, the .35 Whelen will generate 3,500 ft⋅lbf (4,700 J) at the muzzle from a 24 in (61 cm) barrel. The .35 Whelen is not the ballistic twin of the .350 Remington Magnum and falls about 500 foot-pounds short. With the correct ...