I spot and stalk them on foot. Shoulder shot a ~250 lb boar about 10 years ago with a 7-08 and a 140 grain TSX. Perfect shot placement, but the bullet apparently didn't penetrate the shoulder bones and he ran off, never to be seen again. Next pig hunt, I used my .470 NE loaded with 500 grain Woodleigh softs. It was very effective on a 355 lb boar at 50 yards with a shoulder shot and a lot of fun to hunt with.
In recent years, I've settled on a 9.3x62 with a 286 grain TSX. IMO, a perfect pig rifle. Quite effective on shoulder shots.
Lesson learned: If you're going to shoot them in the shoulder, use enough gun.
My God, the level of stupid that flows from you is only surpassed by the level of stupid that spewed from your father into your mother.
