Here's what hunters and shooters need to know about the 5.56 vs .223. The two rifle cartridges are similar but have important differences.

Best of all, it falls into the range of both 5.56 NATO and .223 Rem., as per the 10th edition of Hornady’s reloading manual, making it safe for both chambers as well as the .223 Wylde.

When it comes to the 223 vs 556, it’s not so much about which one is best, but about the differences between them. The 223 Remington and 5.56 NATO cartridges have identical case dimensions but ...

Ruger has introduced the Ruger Precision Rifle chambered in 5.56 NATO/.223 Rem., usable with a wide range of readily available ammunition, and broadening the appeal of the already very popular rifle.