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I think the penny just dropped. Finally.
The part that I hadn't understood clearly enough is that the ONLY function of the SP OAL gauge in this context is to hold the bullet in the comparator.
Where the rabbit went into the hat was the fact that, having found the measurement of the case, bullet (to the ogive) and comparator, you then SUBTRACT the width of the comparator. What you are left with is the info you were trying to come up with from the beginning.
Do I finally have it?
Thanks for all your patience, guys. This stuff is not intuitive.
Frank
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