As another poster said, the problem is much worse in Texas. Here is a link to
Not Again, Feral Hog Control in East Texas a +100 page blog about one farmer's war against feral hogs. Once you start reading it, it's hard to stop, for some odd reason. He also finds that an AR-15 is not the best weapon to use in this case; IIRC, he favors something like an AR-10.