TexasCHLforum.com

The difference is, you have a right to defend yourself. You do not have a right to patrol the streets of Austin meting out vigilante justice against car thieves.

Carrying a shotgun on the campus is very likely to get you arrested (if not shot), I believe it's a third-degree felony. If you're a student, you'll most likely be kicked-out of school, too.
While openly carrying a long gun is technically legal in Texas (off the campus), disorderly conduct, breach of peace, things like that, are not. I suppose you are an adult, so you can choose your own path, but I think this is a terrible idea. One person walking around Austin with a shotgun is really only going to raise awareness that there is a guy walking around with a shotgun. I'm not sure what you are trying to prove, but this sort of thing would not help out the cause of those interested in protecting gun rights. If you want to get involved, there are far better ways than this.