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The .243 Winchester Super Short Magnum or .243 WSSM is a rifle cartridge introduced in 2003. It uses a .300 WSM (Winchester Short Magnum) case shortened and necked down to accept a .243in/6mm diameter bullet, and is a high velocity round based on ballistics design philosophies that are intended to produce a high level of efficiency. [2]
This allowed a wide range of bullet weights to be used with a single bore size; the .450 Black Powder Express, for example, was loaded with bullets ranging from a 270 grain hollow point bullet for small game such as deer, to a 360 grain solid bullet for use on dangerous game, to even heavier hardened bullets for use on elephant. The early black ...
With the advent of smokeless powder, which has a far greater energy density than black powder, it was possible to generate far more power in the large cases of the older black-powder cartridges such as the .32-40 Winchester and .38-55 Winchester. Some black powder cartridges such as the .32-20 Winchester and .44-40 Winchester were chambered in ...
The powder used in the Stinger increases velocity up to the longest .22 barrel length tested by the NRA, 26 in (660 mm). [26] Later hyper-velocity rounds were introduced by other makers, based on the long rifle case with lighter bullets in the 30-gr weight range and slow-burning rifle powder loadings.
The ballistics of the .950 JDJ are more similar to that of the 20 mm autocannon round, which delivers approximately 39,500 foot-pounds force (53,600 joules). The muzzle energy of the .950 JDJ is comparable to the kinetic energy of a 2,800 pounds (1,300 kilograms) automobile traveling at 20 miles per hour (32 kilometres per hour).
The .600 Nitro Express is a slightly tapered walled, rimmed, centerfire rifle cartridge designed for use in single-shot and double rifles. [4]The cartridge fires a .620 in (15.7 mm) diameter, 900 gr (58 g) projectile with three powder loadings: the standard being 100 gr (6.5 g) of cordite at a muzzle velocity of 1,850 ft/s (560 m/s); a 110 gr (7.1 g) loading which generates a muzzle velocity ...
Indeed, some rounds use bullets weighing almost 1 oz. (28 g ~ 440 gr.), which are propelled at about 1,500 ft/s (460 m/s) – essentially the same performance of a 12 gauge shotgun slug. [4] Bullet weights available for this cartridge range from a 265-grain (17.2 g) jacketed hollow point to a 740-grain (48 g) hardcast lead bullet.
While artillery grain dimensions might be several inches or centimeters, the standard grains of military rifle propellant were 0.085 inches (2.2 mm) long and 0.03 inches (0.76 mm) in diameter. The Army identified this military rifle propellant as Pyro DG (for diphenylamine, graphited), and 500 tons per day were manufactured by various plants ...