Headspace too tight is one possibility. How did you headspace the barrel when you installed it?
When you close the bolt on an empty chamber, does it close smoothly? Or is it hard to close?
Did you try to chamber a resized case (no primer, powder or bullet) to see if it chambers easily after resizing?
On your loaded rounds, did you check to see if the primers happen to be sitcking out a little?
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