History
The .223 Remington (5.56x45mm) is a cartridge that is ballistically in-between its predecessors, the .222 Remington, and the .222 Remington Magnum. The 223/5.56x45 was developed to fit the action length of the new M16 service rifle. The 223/5.56mm quickly became popular as a civilian cartridge because of the availability of brass, and the chambering of commercial varmint rifles in that caliber. Shortly after military acceptance of the M16, the semi-automatic version, the AR-15 became available, making the .223 cartridge even more popular.
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