Another element will be to gently seat primers to compress the protruding anvil flush with the edges of the primer cup. 223 Rem. They suggested CCI (harder primers) for all loads Utilized in any firearm that has a no cost floating firing pin given that the AR does. Other wise, https://federalprimers25601.bloginwi.com/65674383/the-2-minute-rule-for-federal-match-ar-primers