The Blackout is a blast to shoot, most of my rounds down range have been in an AR pistol, not really a hunting gun, but it's great fun shooting many IPSC targets scattered about, and I've bagged many coyotes with a 16 inch gun, big difference between a yote and a pig though.
For hunting:
300 Blackout 125 BT going 2250 FPS gives approx 1450 Foot lbs Energy
6x223(45) 85 GR 2800 FPS 1480 FPE
7.62x40 125 BT going 2400 FPS 1600 FPE
6.5G 107gr 2700 FPS 1730 FPE
6.8 SPC, Wilson 95gr TTSX 2950fps 1800 FPE(out of an AR, NICE)
For comparison, I've shot many Muley's with a 308, 165 BT at 2700 fps 2700 FPE, but damm that AR10 is heavy(usually lugged a bolt gun,lol)
Pick your power level.
Maybe someday I can buy some 300 Blackout ammo from Wilson, 125 BT or maybe a lighter 110 TTSX, it will be good predator(it won't matter how many legs either) ammo.
Which upper, both of course, and which ever one gathers dust, sell it off.