Hogs are tough. A perfect hit in both lungs can result in the pig running over 100 yards at full speed. He may only live a few seconds; but that is enough to get out of sight.
I use scary sharp Tuff heads on pigs. Last week I shot a nice boar with a 25 yard shot from a 41#@26" Black Rhino 52" recurve, drawn 28". The Tuff Head went through the 3/4" shield and both lungs. Stopped against the other shield. I found good blood, still more than 100 yards from the shot, even with just 1 hole. I also shot a 100# sow with a 45# longbow and Tuff Heads with a complete pass through. Good blood trail all the way. Double lung hit, but 100 yard trail.
Shot placement is the key, but expect them to run farther than a deer. Both pigs ran in a straight line as hard as they could go, and died in seconds.
Here is a picture of the shield inside the hide, on a 130 pound boar. It takes a good, sharp broadhead to cut and penetrate far enough with lighter bows. Also, the lungs on pigs are much smaller than deer, and harder to hit.
P3120526 by
okawbow , on Flickr