[tobnpr]

OP already has the 6.8, and bullet selection is getting better to where it can get closer to Grendel ballistics than before.

I'm a huge fan of the Grendel though- and now that Hornady has introduced the 123 V-Max in addition to the AMax, it should make an awesome hunting round as well.

But I'm not sure what the OP is looking for...
Range?
The .223 fits the varmint/dog bill.
The 6.8, deer and hog- though "bigger" would be better for big boars.

The .30 cal selections are only "good" to about 100 yards- then they drop like a rock and lose substantial energy. If your shooting is inside that range, worth considering.