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jmorris · August 13, 2018, 08:12 PM

While that can be useful information, it’s also obvious that a .3750” dimension simply cannot work as a “datum point/intersect location” for every round we reload.

So again, it’s simply a reference point, change the diameter and you change the point, by how much depends on the taper.

If you are making relative measurements you can pick any diameter you want, to be the “Datum point”. A really good one would be to take a drop off the barrel blank and use the same chamber reamer the chamber was finished with but that’s a bit beyond the topic.

August 13, 2018, 08:12 PM	#18
jmorris Senior Member Join Date: November 22, 2006 Posts: 3,077	While that can be useful information, it’s also obvious that a .3750” dimension simply cannot work as a “datum point/intersect location” for every round we reload. So again, it’s simply a reference point, change the diameter and you change the point, by how much depends on the taper. If you are making relative measurements you can pick any diameter you want, to be the “Datum point”. A really good one would be to take a drop off the barrel blank and use the same chamber reamer the chamber was finished with but that’s a bit beyond the topic. Last edited by jmorris; August 13, 2018 at 08:25 PM.