Why .223 and 5.56 remain widely misunderstood. The post How .223 and 5.56 Became the Most Misunderstood Cartridges appeared ...
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How .223 and 5.56 Became the Most Confused Cartridges Ever

For most shooters the difference between .223 Remington and 5.56×45 NATO is minor, but it matters because 5.56 is typically loaded to higher pressures and uses a slightly different chamber leade.