so why the BO now? Its been around since the 70s? Or so.
I think it has more to do with the increased interest in suppressors. I have three 5.56 AR's, two 300 BO AR's and 0ne Rem 700 BO. Anything supersonic I use the 5.56/.223 but there's nothing more fun to me than shooting the blackout subsonic and suppressed. I actually harvested a Whitetail buck with my suppressed model 700 this past year. I don't recommend it but I did it at 30 yards with a 208 Amax.
Thats what I've been saying, its a pretty ideal round to run suppressed. Which is what I do. I've shot enough suppressed subsonic deer/turkeys now, that I can't recall the number. Over 10 for sure, I just don't keep track much anymore, and out to right at 175 yards.