To not hijack this thread but a colleague of mine that generates ammunition suggests the Federal 210M primer. Why, I have no idea as he was striving not to present me proprietary data. I'll use the Lee Hand Priming Software Once i get all around to using the Feds. Ken, https://large-rifle-primers-winch63715.blogoxo.com/31991989/an-unbiased-view-of-federal-primers-ammunition