If just one powder and projectile largely for subsonic loads turns out to operate for .300 Blackout that could be good. If it turned out to that CFE 223 could fill that role that would be the best of all worlds. Just warning when hunting with .three hundred Blackout subsonic https://reloading-300-blackout-aa38405.tokka-blog.com/38113322/the-definitive-guide-to-300-blackout-brass