Here's a quote from the instructions that came with my Redding Titanium 9mm dies which I bought because my 9mm brass had a bulge on the bottom that I thought was being caused by my dillion dies.
"IMPORTANT NOTE
Carbide pistol dies are not designed to full length size cases. Adjust the die to size only the portion of the of the case that has been expanded during firing. On somecases an undersirable ring or belt may appear near the base if the sizing die is incorrectly adjusted. This may weaken the case and is not desirable"
I went into shock when I read this. I've been full length resizing 9mm and 38 for years, and getting a bulge at the base for years.
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