I'm not going to measure again though in the future other than to set the dies up initially. Kinds of a one time thing while investigating those inconsistent numbers reported in the first post.

Also, am I using the wrong terminology to refer to the case's head-to-shoulder-datum measurement? Or is it in fact called "case headspace"? Someone is sharpshooting me on another forum where I've posted this, with regards to my terminology (without suggesting the correct terminology), but I've looked up the terms for various case dimensions and "headspace" seems to be correct.