TexasCHLforum.com

DFW Gun Range in Dallas has a sign prohibiting entry with loaded guns, but it specifically says that the prohibition does not apply to CHL holders carrying concealed.

Either it is the legally required 30.06, or it is just like a sign that says "bad guys with guns not allowed to enter", and not really prohibiting carry by CHL holders. It is a surreptitious means of telling CHL holders who know the laws that carry by them is acceptable, while excluding others.

I previously concerned myself with abiding by incorrect signage, until I realized that people really do post slightly incorrect signs to keep out those who aren't as familiar with the law from carrying. If concealed means concealed, the sign is not 30.06, and you are not asked to leave or disarm, then do your thing.
On the other hand, while it is possible that "gunbuster" signs are intended to deter carry by all, I hope a gun-related business owner would know the rules.

I would also say that it is less safe to unholster and clear your weapon in the car than on a range, and not really in the spirit of CHL to hope that you don't need your weapon on the drive over. Leave you weapon in the holster. Once on the range, wait until the range is running, then unholster, point downrange and unload, one way or the other. Obviously, you do not handle a loaded weapon during cease fires.