Just got back from our Colorado muley hunt. Have to say the elevation got both of us. As someone who can hike around forever at home with no issue it was wild to have the thinner air slow me down. I got one rushed shot at a doe. Didn't have time to range her and shot right under with my 40 yard pin. Walked it off at between 45-50 yards.
Did see some great country and had elk screaming at 10,000 feet all night.