Referencing the previous quote:
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Chambers cut to .223 Remington specifications have a shorter leade (throat) area as well as slightly shorter headspace dimensions compared to 5.56 mm "military" chamber specs, which contributes to the pressure issues.
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That in no way indicates the 5.56 is "sloppy" at the base of the case. That is leade from the bullet to the throat. Headspace has nothing to do with small base or regular resizing. You do not need small base dies just because it is a .223 chamber or a 5.56 chamber. And I believe any difference between SAAMI .223 cases dimensions and NATO 5.56 cas e dimensions are measured in the ten thousandths of an inch, hardly significant.
If your rifle has an undersized chamber at the base of the case area then SB dies may be necessary. But it has nothing to do with .223 versus 5.56, EXCEPT that target barrels with min spec chambers are more likely to be .223, but this does not mean that all .223 rifles have match grade chambers.