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Originally Posted by houndawg
I just don't see the need to over complicate what is nothing more than a simple straight line measurement.
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Under-complicate. You may be missing that I am eliminating one source of cumulative tolerance error with a single reading, something that requires two separate measurements and a calculation to eliminate with current commercial tools. Maybe I've failed to communicate the object of the exercise adequately? It is to improve the precision with which I control bullet jump, keeping in mind the case-head-to-shoulder-datum dimension has some variation among cases coming out of the resizing die that becomes variation in bullet jump that is not accounted for with a single measurement by the current crop of commercial tools. I freely admit the error is typically small enough to be of unlikely significance to most loads. The error would only be a significant percent only of very tight jump values of a few thousandths.
Anyway, the datum argument has run its course, I think, and sides have been chosen. Probably time to think about closing this out. I'll leave it up for rebuttal for another day, then shut it down.