Good point. Hardway is correct. You mentioned "Black tail" in your thread.
Especially in the southern C-zones, most everything you will see can not be differentiated from a true blacktail deer. They look exactly like blacktails, their racks are similar and they weigh the same...for most intents and purposes you are hunting blacktails. But, there can be a muley mix in there, however many generations back, and on occasion an outsized rack of horns does get taken. So, none of the C-zone deer can be called true blacktails or considered for Boone and Crockett recognition as such.
I have found that the farther north you go, the more likelihood that you will run into the muley strain or the muley-blacktail cross.
Joey