And in shorter barrel lengths (~eight″) the 300BLK is much exceptional for supersonics, not less than. Long barrel 300BLK is close to pointless IMO, you will find other rounds that outperform it handily in the exact same platform, with very same duration barrels. Measuring only at 1.seventy two″ in size, https://brass300blackout38269.blogsumer.com/38046579/300-blackout-bullets-for-reloading-can-be-fun-for-anyone