I've got a feeling you're exactly right. I think Steve has even knocked over a few elk and some other big deer with them.
I like your shot placement - I've ear-holed a few and that generally leaves them in a pretty serious bind - seems like head shots and neck shots are easier on hogs for some reason - pretty fair targets that just seem to attract the cross hairs...grin.
Nice going on all you're doing with your son. He seems a natural with lots of God given ability and a real interest and enjoyment in hunting.
Wish there were more boys doing lots of that with their Dads!
Congrats and my best wishes for a happy and profitable New Year - especially in the things that really matter!
DJ
PS - love your signature comment on TV target practice!