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.
The cartridges .223 Remington and 5.56×45mm NATO often get lumped together, but the confusion around them has a long, tangled history. Though they look nearly identical, critical differences in ...
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