This is from Texas Parks and Wildlife......
How do I hunt feral hogs?
Although feral hogs are not classified as game animals, a hunting license is required to hunt them. Feral hogs are very intelligent and considered to be challenging quarry. Many hunters consider the long tusks and mean appearance a genuine trophy, in addition to the quality of meat. They also provide a great off-season challenge and opportunities to hone hunting skills and spend time in the field.
There are many hunting techniques used, including stand hunting over a baited area, quite often incidental to white-tailed deer hunting. Stalking or still hunting over baited areas and areas indicating recent hog activity, such as wallows, are commonly used techniques. Corn or milo, often soaked in water and allowed to sour and then buried underground is good bait.
Night hunting with a spotlight is often used; however, the local game warden must be notified beforehand. (There are certain laws which prohibit using artificial light where deer are known to range.) Hunting with well-trained dogs is another hunting method utilized and can be very exciting. Because the feral hog has such a tough hide the best rifle calibers to use should be a .243 or greater to prevent wounding and loss of the animal. Bowhunting, muzzleloading, and handguns are also popular among sportsmen to hunt feral hogs.
I've hunted hogs in my backyard here in Texas and I've never heard of a caliber restriction on hog hunting in this state.
A guy I work with uses dogs and a Bowie knife!
( I use my 30-30 )