In supersonic form its a fair bit more potent than the .223 on, umm, thin skinned game. It's like having a 7.62x39 that will actually function in an AR-15.
So, a guy has a 223, 308 and 300BO...which one does he hunt deer and hogs with? Which one does he hunt crows and coyotes with?
What does that leave for the Blackout, other than shooting suppressed?