223 rounds for my AR. I wish to use Hornady 150gr BTSP bullets, but can’t come across any data to support that. Encounter tells me the 550 press prefers a ball type powder. Any concept exactly where to get started on? You will have to tweak subsonic handloads according to https://300blackoutreloading96295.topbloghub.com/44176976/top-300-aac-brass-secrets