You know...if I had a population of hogs to hunt here in Illinois I'd just use what I use on deer. Either my 70# bow, my mossberg 695 bolt action shotgun with 1 1/4 ounce lightfield hybred sabots or my Omega with a 330 grain bullet on top of 110 grains of Black Mag 3. I think either one of those three weapons would kill hogs, but since you stated guns then I'd go with the mossberg 695 12 gauge with the lightfields slugs. I don't believe there is much in North America that can keep going after being shot with a 1 1/4 ounce slug...but I could be wrong.

Paul