James Calhoon did as good of an explanation on primers as I have seen published yet. The following link is his published data you will see the CCI 400 cup is thinner (by a little more than 11%) than the federal 205 primer most commonly recommended by Hodgdon & Hornady Load data. In any times the following data can be useful & especially in times of shortages.
Measuring cup thickness is relatively easy to accomplish. Cup hardness may require instruments fewer of us have at our disposal.
http://www.jamescalhoon.com/primers_and_pressure.php
Measuring cup thickness is relatively easy to accomplish. Cup hardness may require instruments fewer of us have at our disposal.
http://www.jamescalhoon.com/primers_and_pressure.php