http://battleroadusa.com/
The course will have 4 pistol stations and 3 rifle stations. Pistol stages will be from "brain breath distance" to 30 yards, and rifles will be from 50 to 400. The course will be approximately 2.5 to 3.5 miles long, and you will have to carry your rifle, pistol, ammo, water, and all other gear with you the whole way. There will be plenty of obstacles along the course to help get the blood pumping. If you shoot the course with no misses, you would need a minimum round count of 177 handgun rounds and 150 rifle rounds. Yes, that is a lot of ammo to carry... it is set up that way on purpose!
More info can be found on the above-linked website. Check out the detailed course of fire and BattleRoad's blog entries for more details.
Buckholts, TX (north of Austin) is a bit of a drive from Oklahoma, but this shoot will be completely worth it. I will be one of the RSOs and running as well. I did one of these "Run n' Guns" in Pecos, TX back in October, and it was an absolute blast. It is a real test of yourself and your equipment. It would be great to see some fellow OSA'ers down there representing!