I live in Texas and have shot a few wild hogs. They come in all sizes and all are legal 24/365, as is trapping them, and shooting them with full-auto from helicopters. It is probably legal to blow them up.
A .223 would be light for body shooting the bigger ones, but a lot of people use accurate light caliber rifles and try for head shots. The only real trophy is one with large tusks, which makes a reasonably impressive mouth open shoulder mount. Or better IMO, a cleaned skull with big tusks sitting near the fireplace. I digress, but my point is that since you usually aren't trophy hunting per se, and since they are usually plentiful when you find them, waiting for a good head shot is usually not difficult.
But if I'm going pig hunting, I just take a deer rifle, .30-30, .270, or larger if you want. Much of the choice being about the expected type of hunting and range.
