I have re-sized (de-primed) primed cases before. I suppose you should do so very carefully...( it may be safer to just fire the primed case in your rifle without loading with powder and bullet, then de-prime the spent primer ). My guess is your cases did not get necked properly the first time because the collet is getting hung-up inside the die. Before proceeding, take it apart, polish the collet with fine grit sand paper or emery cloth, clean, and then lube with white lithium grease. You may have to do this several times until everything moves freely inside the die. After that, you should be good to go.
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