Randy,
I don’t document that measurement unless it presents longer than expected, but I would say 5/8-3/4 is the range where I see the nose of the cone. I should also like to confirm my statement as many, not all. When we see .010 or better in thickness change in a 3/4 inch travel....that is steep to me. On the other hand, other barrels in the sample only change a few thousandths. I only included one Parker where I believe the chamber has been lengthened.
I have had a different experience with concentricity. I find a good number of my original, maybe even mint Parkers to have inconsistencies in MBWT at the same longitudinal point.
Best,
Dean
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