To not hijack this thread but a colleague of mine that generates ammunition indicates the Federal 210M primer. Why, I don't know as he was seeking not to present me proprietary information. I'll use the Lee Hand Priming tool when I get all around to utilizing the Feds. Ken, the https://winchester-250-magnum-pri93603.bloggip.com/31881334/the-definitive-guide-to-are-federal-primers-good