As long as Terry is teaching, I will throw in a few more tidbits.
Just some things that I have noticed about hogs after the shot. If you hit a hog in the guts or soft tissues, especially after dark, they usually scoot out of there and keep on going. If there is a sounder, they usually join with the rest. The odds of recovering a hog that behaves like that are slim. If they run initially, then stop and stand in cover, away from the rest of a sounder, or as a lone hog, they are usually hit hard, and will likely die within that cover, often quickly, if not pushed. I always feel good about a hit where they do this. Sneak out of the area and come back quietly in an hour to check things out if I can.