If your coming to Texas, and you plan to hunt you have to have a license. It doesn't matter who's property our on, or what the damage is, your required to have the paper. Depending on your age you might also need to have the Hunter's Ed card with you as well.
You even have to have a hunting license to gig frogs here.
IF you plan to come and hunt, I would highly suggest checking the online rules and regs for what you will actually need.They are getting more and more strict on things and posing more expensive citations for even the minor offenses.
That said,
Your choice of weapon is only as good as you can shoot it. Spraying the area works on occasion, but accurate placement is always better. Also I would suggest using something with an expanding bullet. Might be mistaken but somewhere in the regs it states something about FMJ ammo. Granted hogs are not game animals here, but still better safe than sorry.
Bring plenty of ammo and take as many home as you can afford, or can find. I promise nobody will miss them.