The advice about shooting them "way forward" may sound a little misleading...not to mention vague to someone whose never killed a javelina before. The vitals on a javelina are a little smaller than softball and the highest percentage shot is midway up the body right behind in tight behind the collar. I've seen many people shoot them in front of the collar (when the animal is standing broadside) and these are animals that are typically never recovered.
Shoot them in front of the collar and you will also think (as a friend of mine once said) that javelina are filled with sand, not blood.
Also, a little trick to finding a mortally wounded javelina that, nonetheless, leaves little or no blood trail...a lot of the time when a javelina is mortally wounded they will run a wide semi-circle around the place where they are shot. They will almost always run this arch listing to the right. It's a crazy thing but it's so common that Kent Ostrem (Mahaska Custom Bows and the guy who showed me this tracking trick after, himself, tracking a couple hundred javelina for clients) calls it the Semie Circle Of Death.