Neck sized cases usually close with a Little resistance as pretty much what Marty Henry said. I have been sizing loaded 223 rounds with a modified die as the shoulder needs to be pushed back about 1-2thou.They were sized for a different rifle. The person who's lee die i borrowed had modified the die because he had to do the same a while ago. I mentioned it wasn't obvious whether it was the shoulder or the base that needed sizing as even 1 thou let the bolt close easily. We talked about it and he did mention Lee dies were supposedly known for not sizing toward the bases so well. Not sure if there's any truth to that but maybe see if you can borrow another die?
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