223 rounds for my AR. I wish to use Hornady 150gr BTSP bullets, but can’t obtain any knowledge to help that. Encounter tells me the 550 push prefers a ball style powder. Any thought where to get started on? Given that the 300BLK was initially created for the AR-15 and https://andersondxkvf.ivasdesign.com/59972276/the-5-second-trick-for-300-blackout-cases