223 rounds for my AR. I choose to use Hornady 150gr BTSP bullets, but can’t find any info to guidance that. Knowledge tells me the 550 press prefers a ball variety powder. Any concept exactly where to get started on? Given that the 300BLK was originally designed for the AR-15 https://brass300blackout85284.designi1.com/59225870/the-2-minute-rule-for-300-blackout-reloading