I've been thinking about going the AR pistol route and was looking at 300 BLK. I have seen comments that muzzle blast is not as severe as 5.56 out of the shorter barrels. The most recent gel testing I have seen is a few years old and all of the loadings exhibited penetration of greater than 18".

There a couple of Hornady offerings I haven't seen any data for, 110 gr. GMX and 135 gr. Flex Tip. From an HD scenario, and tested against the FBI protocols, does anyone have any data on these? Any other options out there - aside from the Barnes black tip?

Thanks for your help!