Not to hijack this thread but a buddy of mine that makes ammunition suggests the Federal 210M primer. Why, I do not know as he was striving not to offer me proprietary information. I will utilize the Lee Hand Priming Resource when I get all-around to utilizing the Feds. Ken, https://federalprimersfor9mm68901.ltfblog.com/30988470/the-smart-trick-of-federal-large-rifle-magnum-primers-215-that-nobody-is-discussing