What is an improper 30.06? Do you mean like a hand made one, not to specifications, or that it doesn't belong at that establishment?hence we have so many inproper 30.06 signage.
Edit:
From the Texas Safety Network website:
This may not be an official site but it seems informative.For establishments for whom alcohol makes up less than 51% of their business, a sign must still be posted at each entrance reminding customers that if the 51% limit is reached, the same penalties will be applied.