223 Rem. They recommended CCI (harder primers) for all loads Employed in any firearm that has a cost-free floating firing pin as the AR does. Other wise, they claimed, it matters very little and all main makes will ignite in regards to the very same. And finally, all the rest https://rowandsfqb.theblogfairy.com/31214764/210-federal-primers-for-sale-for-dummies