And in shorter barrel lengths (~8″) the 300BLK is way superior for supersonics, at least. Very long barrel 300BLK is close to pointless IMO, yow will discover other rounds that outperform it handily in exactly the same System, with exact same size barrels. The aac-sd with 110gr Sierra varmint bullets https://troyufqbk.daneblogger.com/37685349/5-easy-facts-about-brass-300-blackout-described