"Rifles, airguns, handguns, slugs, <#2 shot, and muzzleloaders are prohibited. All applies to all hunting area unless specially noted above."
The above quote was taken directly from here: https://lavonlakehunting.tamu.edu/policy
It appears that you cannot use slugs.. So, it looks like 00, or 000 buck shot is okay to use there. You might want to read through the information at the link I provided and see if you can make better sense of it than I can.