223 rounds for my AR. I need to use Hornady 150gr BTSP bullets, but can’t come across any info to aid that. Working experience tells me the 550 push prefers a ball kind powder. Any plan exactly where to get started on? In her spare time, she shoots in NRL22 https://300aacbrass07484.worldblogged.com/45222506/the-definitive-guide-to-300-blackout-projectiles