Never to hijack this thread but a colleague of mine that generates ammunition implies the Federal 210M primer. Why, I have no idea as he was attempting not to present me proprietary information. I will use the Lee Hand Priming Device Once i get around to using the Feds. Ken, https://arthurywvql.howeweb.com/32449252/5-easy-facts-about-federal-gm150m-primers-described