Never to hijack this thread but a friend of mine that provides ammunition implies the Federal 210M primer. Why, I do not know as he was trying not to give me proprietary facts. I'll utilize the Lee Hand Priming Resource After i get around to utilizing the Feds. Ken, the https://federal-benchrest-primers31840.theblogfairy.com/31220609/5-simple-techniques-for-federal-gm-210-primers