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Bottom line - firing 5.56 in a .223 chamber means you are firing the wrong ammo. You might get away with it, or you might seriously damage your rife (and / or yourself).
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In 1968 I acquired a huge quantity of 5.56mm ammo. Had my Sako re-chambered to .223 at that time. That gun and several others that I own have digested thousands of rounds of 5.56mm ammo without a bauble.
SAAMI represents US commercial ammunition manufacturers. They waited 20 years until 5.56mm military ammo had flooded the market to spring this revelation on us. This is the same SAAMI that asked the BATF for a revision of ammo manufacturing and storage rules and then whined to high heaven when trhe BATF did just that.