223 rounds for my AR. I would like to use Hornady 150gr BTSP bullets, but can’t uncover any data to guidance that. Working experience tells me the 550 push prefers a ball kind powder. Any idea in which to start? Persist with released data only, the one exception is it https://300-blackout-reloading18053.blogpostie.com/58980235/the-fact-about-300-blackout-cases-that-no-one-is-suggesting