The only non 5.56 calibers I am interested in are:
.224 Valkyrie and .50 Beowulf. Maybe .458 SOCOM. I handload so ammo cost is not much of an issue. Component costs for a build in the .458 or .50 are however.
All three of those will work fine on hogs. Really, the variety of guns for hog hunting is vast. I have seen everything from .17HMR to .50 Beo used down here. I just use my Blackhawk 45 Colt myself. Since the variety of guns for hogs is so vast, it is jokingly used as an excuse to justify purchases. I have heard many guys exclaim, and have done so myself, "Well, I can always use it for hogs!".