It's definitely a nanny. You have heard the saying "nanny, nanny, nanny goat, can't catch a billy goat"? Do you see a second goat in the picture? Therefore it is a nanny.
I would agree, Nanny Tall horns but not much mass at the base. Too much room in between them. I've never hunted them, but this is great practice! I just found out I drew a AK Mt. Goat hunt, Yee Haw!