Not to hijack this thread but a friend of mine that produces ammunition suggests the Federal 210M primer. Why, I do not know as he was hoping not to offer me proprietary info. I'll utilize the Lee Hand Priming Device After i get close to to utilizing the Feds. Ken, https://federal-ar-match-primers28272.onesmablog.com/a-review-of-federal-gm150m-primers-72424001