And in shorter barrel lengths (~8″) the 300BLK is far superior for supersonics, at least. Extensive barrel 300BLK is in close proximity to pointless IMO, you will discover other rounds that outperform it handily in a similar System, with identical duration barrels. We also use 3rd-party cookies that aid us https://johnnydxlvf.tkzblog.com/38583390/top-300-aac-reloading-secrets