I think if you mentally equate the 300 BLK as a magnum pistol caliber you are coming at it correctly. As a rifle round it's pretty pathetic, especially the subs. I think the LeHigh bullets are the only 300 bullet that will expand worth a squat at subsonic velocities. The Barnes TAC-TX is a great choice, but is a super.

I certainly enjoy shooting mine. I'll probably enjoy it more when I get my SBR and Griffin Paladin stamps, but subsonic for me will just be for range fun and I'll stick with Barnes for the HD loads.