IIRC, the Lee website has up-to-date the list about which primers are ok to employ. They now seem to solitary out FEDERAL specifically: You'll have to press more difficult the get that nickle to squish back to spherical inside the seat. I'd pull those and never send out them. And https://holdenphbup.anchor-blog.com/12121534/5-simple-techniques-for-federal-large-rifle-magnum-match-primers