I have shot boars with a 7-08 XP-100 pistol and 44 mag. You DON'T shoot the shoulder as you loose a lot of meat! You shoot low and behind the shoulder for a heart lung shot! My first one at about 25 yards that was cornered by dogs, showed a nice broadside which is shot hear-lung. It still sood while I reloaded. It turned and then fell, dead! They are not tough animals to kill, if you use prpoper bullet placement. On one trip, there was a fellow from Boston that shot them in the head with a Marlin 45-70 lever action. Never lost any meat and he made jewelry from the tusks.
Henry