I experienced that as well on a 260 criterion once. I would mark the case and try several bullets keeping the index mark at 12:00. It always drug in the same place. so I figured the chamber was not concentric. What I should have done was rotate the tool 180* and compared the orientation of the mark to determine if it was the tool or the chamber. Also check neck RO on the modified case. Unless you have tools to check it you will never know. Hoping others had this issue and found something, I think I gave up to soon.
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