I've compiled a list of Austin ranges here.
Texas Gun Ranges
http://www.subaruwrxsti.org - Subaru WRX STI Information and Tuning Resource
http://www.vikingspeedshop.com - Tuning Parts for Subarus and others.
AND.... Don't dis the .308, It's killed more people than you've ever met.
If it wasn't so damn hot I'd shoot three or four days a week at least.
I live south of Dallas so I can't help much with those places. It is cheaper down here but we don't have all of the fancy restaurants and shops that cater to our every whim.
If you are close to Richardson, you can swing by my work and I'll check it for you. Just bring food.