Two of the most popular cartridges today are nearly identical and sometimes considered transposable, but when looking at 5.56 vs .223, there are some key differences. The .223 Remington started as a ...
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.