This is taken from a local hog guide (Tn Extreme Hunting Adventures).
"A sight-in-range available for rifle and archery. Suggested guns include: 30-30, 32 Special, 35, 30-06, 308, 270, and 44 Magnum, 444, 45.70, 454 casull, shotgun with rifled slugs, bows, muzzle loaders."
If you are so inclined you can use a boar spear or knife (6" or more blade). On a more personal note, the common thread in gun choice amongst the hog hunters I know is short, light, and handy with a big hole (30-30, 35, 41mag, 44mag, 444, 45-70, 450, 454, and 12ga slug). The rifles are pretty much lever guns, the shotguns pump or auto, the pistols are revovlers.
Here the hogs are chased w/ dogs over hill and dale.