Not to hijack this thread but a friend of mine that generates ammunition indicates the Federal 210M primer. Why, I have no idea as he was making an attempt not to provide me proprietary facts. I'll utilize the Lee Hand Priming Device when I get around to utilizing the Feds. https://winchester-small-rifle-pr39494.ziblogs.com/31927527/detailed-notes-on-federal-primers-large-pistol