I can tell you with my 300 blackout pigs don't like to live after they've had a 110 barnes bullet thru the lungs. As far as ballistics the blackout with the factory supersonic loads it is supposed to have a small edge over the 7.62x39 because the cartridge design is more efficient blah blah blah. The reason it has taken the market by storm is that it takes the power of the AK47 and combines it with the accuracy and reliability of the AR15 platform, not that the AK47 isn't reliable. The reliability that people are comparing is the 5.56x45 in the AR15 and the 7.62x39 in the AR15 platform, and the 7.62x39 because of its angled sides it doesn't function very well in the AR15 platform and magazines. Thats where the 300BLK comes in to fill that gap of power in a reliable AR15 package.