As well as in shorter barrel lengths (~eight″) the 300BLK is much exceptional for supersonics, no less than. Long barrel 300BLK is around pointless IMO, you can find other rounds that outperform it handily in precisely the same System, with identical length barrels. Measuring only at one.seventy two″ in size, https://300-blackout-reloading84692.fitnell.com/79772868/getting-my-300-blackout-cases-to-work