223 rounds for my AR. I want to use Hornady 150gr BTSP bullets, but can’t find any information to support that. Knowledge tells me the 550 push prefers a ball variety powder. Any idea the place to get started on? Just caution when hunting with .300 Blackout subsonic rounds. Those https://300blackoutbulletsforrelo57775.verybigblog.com/36760407/details-fiction-and-300-blackout-cases