Yea, from what I've read and seen, Mt. goats are the toughest species to sex/score through glass. Are you planning on hiring a guide, or DIY?
"A man may not care for golf and still be human, but the man who does not like to see, hunt, photograph or otherwise outwit birds or animals is hardly normal. He is supercivilized, and I for one do not know how to deal with him." Aldo Leopold