As well as in shorter barrel lengths (~8″) the 300BLK is way exceptional for supersonics, a minimum of. Long barrel 300BLK is around pointless IMO, you will discover other rounds that outperform it handily in precisely the same platform, with exact length barrels. You will need to tweak subsonic handloads https://mylesdozks.bloggadores.com/36796386/300-blackout-bullets-for-reloading-secrets