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<shrug> for me, my 9mm sizing die goes down to the shell plate, my 223 die crushed the case when I tried that and needed to be backed off a bit.Then I guess I've been fortunate as every FL sizing die I have has made contact with either the shellplate or shell holder, bottleneck and straight walled, and from differing manufacturers. Cam-over...
Very well could have been the luck of the draw (or milling machine). Granted, a case gauge is a good idea to have on the bench.