223 rounds for my AR. I would like to use Hornady 150gr BTSP bullets, but can’t locate any knowledge to support that. Expertise tells me the 550 push prefers a ball kind powder. Any notion where to get started on? Considering that the 300BLK was in the beginning designed for https://edgaratiyg.digiblogbox.com/63455871/the-basic-principles-of-300-aac-brass