I'm seriously trying to buy a belt fed .30 or .50 caliber full auto.
There's a good ol' boy Texas MG dealer named Keith that's pretty heavily into the MAC 10 and .30 Brownings, and he should have a few ideas on ranges in your neck of the woods, too. Check out his website here, and drop Keith an e-mail for a list of the TX ranges he knows of. He's also been known to put on his own mini-shoots in Texas.
There's also a Texas dealer who sometimes has a .30 or two in stock with a website *here*. Link to his .30Browning MG and .50 Browning MG offerings at the links- his inventory changes frequently, of course.
I was disappointed that most of what he has is sold, but I'll keep checking back on his inventory.
I went ahead and joined "Gun Girls" while I was there.
"...exciting defenders of the Second Amendment...."
I'll just make a run up there and talk to him.