re: Question about the 300 blackout..

It was designed to be a subsonic round. My SBR with a 9inch barrel, jp capture spring, and omega suppressor is stupid quiet. The capture spring really quites it down a lot. Really the only thing you hear is the bolt going back and forth. I am shooting 220 gr Hornsby super performance with 11gr of accurate 1680. I am at about 1000 ft per sec.

Well there are a few things. I'm not really sure why people freak out about the subsonic round other than it's fun to plink around with something that is so quiet.

To me supersonic Barnes 110gr bullets make a whole lot of sense out to 250ish yards. The number one reason I like and utilize the round is in my homedefense setup of a 9inchh barrel with my omega on the end of it. So I now have a round that is quiet enough inside of my house that I'm not blowing my eardrums out all while still running with about 1100 foot pounds of energy. About three times that of a pistol and a few hundred more than a 10.5inch sbr in 556. I think just because of its increase of power over the 556 it wins out almost no argument at anything within 200 yards. Where it begins to be outdone by 556 is around the 300 yards mark where t really starts to slow down and drop off.
It can even be setup as a great pig gun and I think a much better option for those ppl who like to deer hunt or let their kids deer hunt with their 556.