Another thing to keep in mind is that your Hornady insert is measuring the bullets position in the case, not the true distance to the lands. Unless the insert was cut with your chambers reamer it has an otherwise random size hole that most likely is not the same size/angle as your lands. It would imply that all chambers are the same. It is a useful too though and can give very repeatable results. I have had the Stoney gauge for a long time and I don't see how you can break it if using it correctly.
Running a pin gauge thru some of the inserts may surprise you also, same with bushings, they aren't all the size they are labelled and our measurements are only as good as our tools.
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