I built a gauge using the same principle as the Hornady, I'm still not sure about it. You have to get the feel of it through use. A little wiggle/twist/push to make sure the case is seated in the chamber and then wishing you had three hands to hold the tube and rod, and tighten the set screw at the same time. At least half the time I still use the tried and true method of deforming the neck on a fired case then seating a bullet long and chambering it. Regardless of numbers in the book, work up to your loads as usual and shoot what works the best.
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