IIRC, the Lee Web page has updated the record about which primers are Alright to implement. They now appear to single out FEDERAL specially: "While there may be some small distinctions in technical specs for that raw brass from one maker to one other, none of it is actually hardened; https://winchester-small-pistol-p73950.techionblog.com/31864419/the-best-side-of-federal-primers-for-9mm