I watched an 80lb shoat get shot with a .50 BMG (old Malaysian surplus FMJ). At about 100-120yds, they hit it in the gut. It ran about 50-60 yards and then flopped over to die.
They hit it low enough that the temporary cavity stretch tore a good sized hole out of the belly; but all in all, not up to some of the hype discussed in this thread.
Edited to add: a quick Google search of "hog hunting" and ".50 BMG" will probably yield some videos.