And in shorter barrel lengths (~eight″) the 300BLK is much superior for supersonics, at least. Long barrel 300BLK is close to pointless IMO, you will find other rounds that outperform it handily in the exact same platform, with similar length barrels. You will have to tweak subsonic handloads based upon https://louisjvhue.blogpayz.com/37955022/getting-my-300-blackout-cases-to-work