And in shorter barrel lengths (~8″) the 300BLK is much excellent for supersonics, at least. Very long barrel 300BLK is close to pointless IMO, you could find other rounds that outperform it handily in the identical System, with similar length barrels. The aac-sd with 110gr Sierra varmint bullets will shoot https://brass-300-blackout11971.digiblogbox.com/62857724/the-single-best-strategy-to-use-for-300-aac-brass