Dave,thanks for answering. I have been doing considerable thinking about why some use the case body. The first thing that came to mind, was that those who developed these different run out gauges, are generally target shooters. I realize they shoot very high pressures. Since they commonly use high grade brass, measurements of the case body tells a lot. And high pressures will shorten the life of the brass, thus the body measurements.
Measuring on centers like the Hornady, and dealing with less than perfect brass, the run out of the bullet and neck are the most important.
The whole picture is beginning to mature and I think I understand why the two different type gauges both have merit.
Thanks
