And in shorter barrel lengths (~8″) the 300BLK is much exceptional for supersonics, at the very least. Lengthy barrel 300BLK is close to pointless IMO, you'll find other rounds that outperform it handily in a similar platform, with exact length barrels. Just caution when searching with .300 Blackout subsonic rounds. https://henrikd049htg7.wikibuysell.com/user