Not sure how he does it. There is a Forster set that comes in .001 increments. The difference between go and no is .006 in his .223 I believe. I personally try for the middle but I have a few that are on the loose end of the spectrum for use in places with things that bite back. Honestly I think the loose ones are more accurate.
I wish I could set brass up to resize to within a half a thou of headspace consistently and measure it accurately. A little too much lube, a speck of crud, etc., and I’m out.
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