IIRC, the Lee Web-site has up-to-date the checklist about which primers are Okay to use. They now appear to single out FEDERAL specifically: A further issue you need to try to remember is that the primers you utilize as part of your .38s are the same primers that you use https://finnfwive.thekatyblog.com/30867882/federal-large-rifle-match-primers-things-to-know-before-you-buy