my grandpa shot them behind the ear angled toward the front and that dropped them right there. a .22 bullet will bounce off the front of the skull if you don't hit them just right.then you have a very pee'd off pig.we didn't have any equipement either ,just walk up to them in the pen,shot them behind the ear,bled them,scalded and so on.we did it very country style.
good luck
good luck