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 ...

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.

Some believe the 5.56 NATO was the original military cartridge and that the 223 Remington was the civilian offshoot. That’s not the case. In 1970, NATO (North Atlantic Treaty Organization) affiliated ...

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** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. ** If you are new to the AR scene, ...