If one powder and projectile mainly for subsonic masses seems to work for .300 Blackout that may be wonderful. If it turned out to that CFE 223 could fill that position that would be the best of all worlds. Such as the a hundred twenty five-grain Nosler AccuBond, this bullet https://elliottmtxcg.affiliatblogger.com/91191647/details-fiction-and-300-blackout-cases