I've been living in Texas for the past 5 years. Needless to say, it's not exactly difficult to find somewhere to hunt pigs here....so that's what I've been doing. Because there is so little public land in Texas, unless you know someone or have a hunting lease, going to a ranch (what they call an outfitter on private land here) is a good idea. Understand that most of these guys see it as a business...you're likely to find that they've fenced off a 30 to 50 acre portion of their property, and they purchase hogs trapped elsewhere to release in there. They'll set you up in a blind close to a feeder that runs on a timer...you get the picture.
Alternatively, you can spot and stalk - but be aware that hogs are smart, have an exceedingly effective sense of smell, have become nocturnal, and love to bed down in cover that is incredibly thick. (I've spent a lot of time working in the bush in Canada, and not once have I ever seen undergrowth as thick as Texas)
I've used a .458 SOCOM for pigs...but that's honestly far more than is actually necessary. I've also found that regardless of hog size, quality bullets (I've had very good luck with Barnes projectiles) make a difference in terms of staying together when hitting tough areas of a pig. Both .30-30 and .308 seem to work very well for myself and those that I hunt with.