I know of a girl that killeda 150lb feral hogwith a 26lb bow. One shot, in the heart, pig was down quick.

Shoot a pig low and tight to the shoulder and you don't need much. I've killed several with my bow set from 50-55lbs and penetration has only been an issue on one I hit in the shield.

Use a good quality fixed blade or a cut-on-impact head and you'll be fine.

Did I mention to keep your shots low and tight to the shoulder?