I have reformed hundreds (over 500 ) .223 to .222 . Just make sure they are well lubricated including inside the neck before you run them in full length die , don't rush when resizing take your time pulling press handle , less chances collapsing shoulder then just trim them to length .Also you should turn necks because necks might be to thick .One more thing , some brass is to thick and hard to reform. Other then that it is easy.
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