Dang CDI, I hope you find him in the morning. AS for the curled tip on the broadhead, I would say you hit something pretty hard. Did you maybe hit the edge of the shoulder joint? I would say with 4" of penetration, you MAY have gotten 1 lung. It will possibly be a long track, but stick with it, and scour the ground close for everything you can find. Take your time, find your buck, and post us some pics of that hawg.