As well as in shorter barrel lengths (~8″) the 300BLK is far superior for supersonics, at the least. Prolonged barrel 300BLK is in the vicinity of pointless IMO, you will find other rounds that outperform it handily in a similar platform, with very same length barrels. Considering that the 300BLK https://300-aac-reloading18517.blogsvila.com/39246775/getting-my-300-blackout-bullets-for-reloading-to-work