I also believe this is a die issue. I had a 6.5x284 that had bolt click so bad it was breaking extractors. After countless hours grinding down shell holders, using small base body dies, the culprit was a very small burr on the inside of the sizing die at the shoulder. One call to Redding and the problem was solved.IMHO your die is not sizing your brass down far enough, it doesn't take much. Try taking just a body die and resize a piece of brass that has the issue.
I hope this helps,
Lloyd