Can you explain this again. Seems like that would give a huge number?
My fired brass reads 1.621" using the Hornady headspace bushing. When using the modified case and tool I get a measurement of 2.255"(to ogive of bullet) so you said add those two numbers?
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I use my case measurements, base to shoulder, and add the gauge measurement, shoulder to ogive. That gives you the OAL to the rifling with your own brass
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Wouldn't you add the difference between the headspace reading of fired case and the modified case?