In January 1964, the .223 Remington cartridge was released to the civilian market for hunting varmints and predators. One month later, the United States Air Force chose the cartridge in the form of 5.56x45mm to be used in their new M-16 rifles.
With its mild recoil, the .223 Remington became popular across many different shooting applications and firearms disciplines, with hunters being the primary buyers. The flat trajectory and reliable accuracy of the cartridge were appreciated by hunters. Some have hunted game as large as deer, but it's important to know that .223 bullets cannot be used for deer hunting in several jurisdictions – as it has been noted that the bullet diameter and muzzle energy are insufficient for harvesting humanely.
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