A further factor should be to gently seat primers to compress the protruding anvil flush with the perimeters from the primer cup. 223 Rem. They advised CCI (more durable primers) for all loads Utilized in any firearm that has a cost-free floating firing pin as the AR does. Other sensible, https://federal-ar-match-primers68900.blogdon.net/a-simple-key-for-federal-match-primers-unveiled-48075301