So, if you get made while carrying in a 30.06 posted place due to not seeing a sign, I assume (hope) that you still have the option of leaving and shouldn't be prosecuted unless you refuse to leave. Basically "oh, sorry, I didn't see the sign, I'm leaving".
Also, is it correct to say that the point of the TABC sign (Unlicensed carry...) is to make it clear that the area is considered "public" and/or the owner only is willing to tolerate CHLs?
Clearly, IANAL.
