We should make the "5.56 vs. 223" a sticky as often as it comes up.
As stated earlier, ammo makers, gunwriters, gunsmiths, Brownells, rifle mfg., loading manuals, NONE of them make it easy for the average Joe to understand. So much so it is ridiculous. You could make a fight for anything you wanted to say about these 2 cartridges, any point you were trying to make, and find some internet babble to "back it up", whether your statement was right or wrong. There is that much BS out there.
Half the [beeep] ARs out there that say "5.56 NATO" on the side are cut with .223 reamers........