RE: ammo. size
Biggest pig I ever killed was a sow, weighed in at 378#. Shot her at around 230 yards.... with a .22 Hornet right behind the ear. It was either the luckiest, or best shot I have ever made. Landowner handed me the rifle and said... shoot that big one. So I did. I was out there to bow hunt... funny how things work out!
Hogs are tough to kill if you hit them in the wrong spot, but they do have a few kinks in their armor.