I don't want 2 holes in the first place. We have found that a bullet that dumps all of its energy into the vitals of a hog does better than a pass thru. 2nd my rifle is set up to shoot the 77gr bthp bullets into little groups with ammo that's less than half the cost of Grendel ammo.You are shooting the wrong two hole bullets. I have killed a pile of hogs and I can think of lots of better bullets than a varmit bullet. Any mono would be better. Fmj suck but any mono hunting bullet or my favorite the 62gr partition is money. But no way would I trade the payload of a 6.5 Grendel for a .223.
We are not "hunting" hogs we are trying to kill an invasive pest and do so as cheap and effectively as possible.
Could a Grendel be better than a 77gr or 62gr 5.56..... yes it could be if hand loaded with a monolithic bullet to get as much speed as possible. But our comparison was done with readily available factory ammo. The best Grendel ammo we found was a $45 a box barnes offering in a 115gr tactx at 2700fps from a 20" bolt gun.
But a 16" Grendel with a 123SST is anemic at best. 2400fps doesn't get me out of the truck.