5.56 NATO and .223 REM are dimensionally the same (external). No difference when at SAAMI specs. Try full length sizing first. Do order your case gauge though. Saves time and aggravation.
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that is my exact thought on it. Just glad to have found the culprit.Easy enough to do. I loaded 400+ rounds of 308 "match" ammo using premium components prepared with the utmost care and ONE in THREE would NOT chamber in my Supermatch or my ridiculously expensive Rem 700 "build." That ammo went into the FAL and M1A standard ammo can, ouch. All could have been avoided if I'd sized them correctly. Who'd a thunk a half a thousandths of an inch could mean so much?