My RCBS 357Sig die began scratching my cases (like you described) awhile back. In retrospect, I believe I was not using enough case sizing lube. I fixed mine by removing the decapping stem from the die and polishing with a short cleaning rod and a tight-fitting patch saturated with Flitz chucked in my drill. I spent about 10-15 minutes spinning the patch back and forth inside the die. Now that I use more lube (from a pump sprayer), I have not observed any new scratching issues.
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