As well as in shorter barrel lengths (~8″) the 300BLK is way superior for supersonics, at the least. Extensive barrel 300BLK is near pointless IMO, you will discover other rounds that outperform it handily in exactly the same platform, with very same length barrels. The punch of a rifle spherical, https://mariosjboe.dgbloggers.com/38984246/the-definitive-guide-to-300-blackout-projectiles