223 rounds for my AR. I choose to use Hornady 150gr BTSP bullets, but can’t come across any info to assistance that. Experience tells me the 550 push prefers a ball kind powder. Any strategy in which to start out? Considering that the 300BLK was in the beginning made for https://brass300blackout07307.thenerdsblog.com/45071782/getting-my-300-blackout-cases-to-work