Looking for a good AR hog gun.

I'm a 6.8 bigot and have killed truck loads of pigs with 12.5-18" barreled ARs in this chambering, but if I were to do it over again now, the 6 ARC would be my jam. It has nearly 3x the energy at 500 yards. It's probably mostly a wash inside of 200 yards though.

My ammo of choice is the XM68GD and Federal Fusion 90g (same GD bullet). Once I burn through the stacks of ammo, I'm going to reload with a stash of 95g TTSX. The Barnes TTSX line is a proven winner on game.
 
JMO, but if you can find a short (11-13") 6.5G barrel that likes the Federal 90gr TNT then you have the perfect hog gun. Terminal ballistics of that bullet have been shown to be outstanding on hogs. I run a 12.5" 6.5G but it likes 123gr Hornady SST and ELD-M much more than Federal.

But, at 50-100 yards (where most hogs are shot) it doesn't really matter. ;)

I also love shooting them with subsonic 300BLK (discreet ballistics makes the best) but hitting them on the run with subs is less than ideal.
 
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I just use my regular ass mk18 with 62grain fusions...it’s a hog...mass eradication is the goal...I usually kill hogs within 25 yards anyways.