Never to hijack this thread but a friend of mine that produces ammunition suggests the Federal 210M primer. Why, I don't know as he was striving not to offer me proprietary information. I will utilize the Lee Hand Priming Device After i get all over to utilizing the Feds. Ken, https://arthurgualw.activoblog.com/33538189/the-best-side-of-federal-large-rifle-magnum-match-primers