How do they chamber and shoot? If the round chambers smoothly and shoots into small groups then don't mess with it.
I have had a case or two in a batch that would be difficult to chamber. I suspect those pieces of brass were slightly harder or thicker wall than the others so I sort them out.
Another thing to look at if you want to is annealing. Some cases may work harden more easily than others and 'resist' resizing more than the others. Annealing solves that issue.
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