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The .450 Bushmaster is descended from the Thumper concept popularized by the gun writer Jeff Cooper.Cooper was dissatisfied with the small-diameter 5.56×45mm NATO (.223 Remington) of the AR-15, and envisioned a need for a large bore (.44 cal or greater) cartridge in a semi-automatic rifle to provide one-shot kills on big-game animals at 250 yards.
Typical bullet weights for factory ammunition are 200 gr (13 g), 210 gr (14 g), 225 gr (14.6 g) and the 250 gr (16 g). Typical velocities for these bullet weights range from 2,960 ft/s (900 m/s) for the 200 gr (13 g) to about 2,660 ft/s (810 m/s) for the 250 gr (16 g) bullet each generating approximately 3,900 ft⋅lbf (5,300 J) of energy.
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)
However, on the contrary to what some competitive shooters and sportsman believe, and as mentioned above, for reloaders there are quite an array of bullet sizes and shapes to choose from. Bullet weights from 125 gr to 250 gr are offered by premium bullet makers such as Nosler, Sierra, Barnes, Woodleigh, Swift, Hornady and other major manufactures.
It can deliver a 250 grain (16 g) bullet with a muzzle velocity of over 1,900 feet per second (580 m/s), developing up to 2,000 ft-lb (2.7 kJ) of energy from a handgun. One Buffalo Bore loading drives a heavier, 300 grain, JFN bullet at 1,650 ft/s for 1,813 ft-lb of muzzle energy. [ 10 ]
The 6.5mm Creedmoor designated as 6.5 Creedmoor by SAAMI, and as 6,5 Creedmoor by the C.I.P. [4] is a centerfire rifle cartridge introduced by Hornady in 2007. [6]It was developed by Hornady senior ballistics scientist Dave Emary in partnership with Dennis DeMille, the vice-president of product development at Creedmoor Sports, hence the name.
Furthermore, heavier bullets will need to be seated more deeply than in the .358 Winchester as the cartridge has to function reliably through a lever rifle's feeding mechanism. For these reasons the factory 250 gr (16 g) bullet loses about 90 ft/s (27 m/s) to the .358 Winchester while the 200 gr (13 g) factory load is only 30 ft/s (9.1 m/s) slower.
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.