ORIGINAL: Georgetownboys
I've shot hogs with stuff as small as a .357 185grlever action open sight, close range yes, under 30yards, they drop just fine. I enjoy stalking right up to them, gets your blood pumping when your laying on your belly in the grass and a 200lb boar finally figures out I am about to drop em.
For longer shots though I've been using .260, .270 and 7RM.