Howdy Fellows,
Stick to the tried and true 30/06, unless you have a very good reason to move to one of the 300 magnums. I recommend Remington's Safari Grade ammo with the Swift A-Frame, or the Winchester Failsafes. The Swift has all the gumption you need for a dead-right-now hog.
Regards,
Albert A Rasch
The Rasch Outdoor Chronicles
Boar Hunting Calibers