I have hunted "Prairie Goats" for ever. It is very difficult to stalk them in open country. They have vision equal to a 10X scope and they use it. They live in very open country and often low Sage no trees.
If you are in the foot hills covered with brush check it out from a high point. The mature bucks will often head to the brush when the shooting starts. The smaller bucks will stay low and make targets.
You should scout the area for arroyos small canyons. Water holes stock tanks are always a good start. If you cannot drive and spot your game you will have to find places where you can make a stand way before day light and not move about.
Sight your rifle for 300 yds and use a 6X power or better scope. If you are hunting horns learn to gauge the horns by the length of the nose and ears of the male. Understand the Black patches on the Bucks face will often make the horns appear larger than they are.They also Puff up the hair making them look larger than they are.
Field dressing an Antelope is very important. The animal has 5 strong scent glands in the rear end. They will often expell the scent when shot. When you skin the animal the oil gets to the meat and you dog will not eat it.
Use a pair of rubber gloves when skining being careful to keep the hair side away from the flesh. Wash or change gloves before handling the flesh side. I wash the skinned animal with soap and water spray the body cavity with 7-up to kill any scent they may have been missed.
Antelope is very good but many hunters do not know how to handle the field dressing. The weather is often very warm another problem. The Goat has a very high body Temp and spoils pronto. Check Colorado law if possible bone the animal as soon as possible put the meat in a cooler. A cooler of cold water and baking soda will wash the blood out in a few hours. You can add fresh water drain ice and then pack for your trip home.
Last thought. The Prairie Rattlers are very active in late Sept. The males are returning to the dens. Be very careful when crawling around the Sage Brush. Any questions PM me. Good Luck.