And in shorter barrel lengths (~eight″) the 300BLK is far superior for supersonics, at least. Extensive barrel 300BLK is near pointless IMO, you could find other rounds that outperform it handily in exactly the same platform, with exact same size barrels. Just warning when searching with .300 Blackout subsonic rounds. https://zachh937blv3.tnpwiki.com/user