Here on Fort Sill, Oklahoma, the Game Warden told me that if I see a hog, shoot it with whatever you have if you're hunting small game. I asked about the ethics of wounding them and was quickly informed that it is unethical to let them live, or even wounding them, that they'll sucumb to their wounds eventually.....
After hunting this area for about a month I can see why. They dig up the food plots, scare the game away, and just make a mess of the land. After popping a couple of hogs with my .22lr, I can see how head shots make sense. Especially after the BB shot from my supernova finally took one of them out. What a resilent/delicious pest they are...
"Semper Fidelis, Good night Chesty."
"Si vis pacem, para bellum"