22Remington Winchester 64Grain 50Rounds
The 22Remington Winchester 64Grain 50Rounds ammo was introduced in 2003 by the Browning Arms Company, Winchester Ammunition, and Winchester Repeating Arms Company. The .223 designation is a reference to the popular .223 Remington. It is currently claimed to be the fastest production .22 caliber round in the world with muzzle velocities as high as 4,600 feet per second (1,402 meters per second), but this is not completely true. The .220 Swift still holds the record as the fastest .22 caliber centerfire cartridge with a published velocity of 4665 fps using a 29 grain projectile and 42 grains of 3031 powder
The .223 Remington is a rifle cartridge, originally developed in 1957 as a commercial hunting bullet for small mid-western varmints; with the first rifle chambered for it coming out in 1963. It has continued to be a popular civilian hunting cartridge.
A military version, M193, with a 55-gr full metal jacket bullet was used by the United States Army in the M16 rifle. The 5.56×45mm NATO was also developed from the .223 Remington
The development of the cartridge, which eventually became the .223 Remington, was intrinsically linked to the development of a new lightweight combat rifle. The cartridge and rifle were developed by Fairchild Industries, Remington Arms, and several engineers working toward a goal developed by U.S. Continental Army Command (CONARC). Early development work began in 1957. A project to create a small-caliber, high-velocity (SCHV) firearm was created.