I pretty much have put the .300 Blk in the same boat as 7.62x39, it's a good defense round best used against people in a short to medium range. If I was going for an AR platform for hunting I'd go with a long barreled 6.8 SPC or .308 AR-10. Or now that I have my .458 upper I can slam some hogs with a big bore round. I am thinking if I jump into the .300 world I'd get it in my first NFA items like a SBR and a can for it to shoot heavy slow movers.