IIRC, the Lee Web page has up-to-date the checklist about which primers are Alright to make use of. They now appear to solitary out FEDERAL specifically: 223 Rem. They suggested CCI (more durable primers) for all hundreds Employed in any firearm which has a totally free floating firing pin since https://federalbenchrestprimers79012.theobloggers.com/38032430/details-fiction-and-federal-large-rifle-match-primers