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.
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