Not to hijack this thread but a pal of mine that creates ammunition indicates the Federal 210M primer. Why, I do not know as he was striving not to give me proprietary info. I'll make use of the Lee Hand Priming Resource when I get around to utilizing the Feds. https://federalprimersfor9mm68901.ltfblog.com/30988470/the-smart-trick-of-federal-large-rifle-magnum-primers-215-that-nobody-is-discussing