I get marks EXACTLY like that from my FCD on the rare occasion it post sizes a case, how sure are you its from the seater? If you are anything less than 100.00% sure, I would bet its from the FCD....
If that's not it, you definitely have a problem.... There is plenty of clearance inside my 9mm seating die.... If you take an unsized case , can you drop it into the die and have it drop out easily? If not, that's an issue. If you can, then the plot thickens....
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