Wack, the .30-30 will be fine, but ditch the see-through scope rings. I use a Marlin .45-70 with an XS Ghost Ring for oinkers. I've also used 30-06, 7.62X54R, and 7mm08.
In reality, any deer rifle is adequate. I don't know if I'd go smaller than a 7MM-08 for oinks, but I know people that use .25-06 , .257 Roberts, and 6mm remington/.243 Win. I don't think that's ethical for pigs, but that's me. Besides, you never know when you're going to run across something for which you wish you had a wider, more massive bullet.
I'd tend to think that a 40S&W could be anemic for oinkers. I raise pot-bellied pigs, and my 1 boar of about 175# has got a really thick, cartileginious covering around his head and neck. The Russian Boar cross, which is what you're looking for, is thicker and tougher. You might think about a wheel gun in .45 Long Colt, .44 Mag, or .41 Mag. And, if you think you get buck fever, wait until you see a boar with 6 or 8" tusks and gonads the size of apples staring you down from 35 or 50 feet. I used to be a cop in Houston, and unless you've learned to fire a sidearm under stress, I'd only carry one as a back-up for oinkers. These can be very dangerous animals. A buddy of mine was hunting up near Cleveland, Texas (about 45 minutes north of Houston) on horseback. A big boar ran out of the underbrush (lots of thick timber and undergrowth in our part of the state) and eviscerated his horse. Did you get that? A hog KILLED his 1000 pound horse.
And no, you absolutely, positively do not need a license to hunt feral hogs in our state. Go here to see the regulation, such as it is, on feral hogs. http://www.tpwd.state.tx.us/publications/annual/general/hunt_licenses/
Go here to register with Texas Parks and Wildlife to find landowners that might meet your desires. https://www2.tpwd.state.tx.us/huntwild/hunt/planning/hunt_lease/
As far as shotgun only areas, I'm not aware of any. You just cannot imagine how rural (and HUGE) this state is. Yeah, 20 million people here, but a quarter of the state lives within about 60 miles of downtown Houston. And once you get west of I-35, "sparsely populated" would be understatement. As recently as about 15 years ago, there was a small ranch within the city of Houston - probably about 1000 acres, give or take. East to west (Orange, Texas to El Paso, Texas) is right at 900 miles. Same thing for south to north (Brownsville to the Oklahoma line above Amarillo) - just a tad under 900 miles. From where I live just northeast of Houston, it's takes me about 12 hours to drive to Atlanta, Georgia and about 11.5 hours to drive to El Paso.
