You want to look for good hieght,ears are typically around 7" long,so stack the ears together and he' s 14 tall,next look for good curl,that is where the horns hook back,make sure he has at least 2" of curl.Now that makes him 16" .Next look for good shovles,that is were the horns palm out make sure they are at least 4" wide and last but not least, realy good mass heavy horns score well.
I hope this helps,and if all else fails,if he looks like he has another set of legs on his head SHOOT HIM !!!!!!!BBJ

P.S. No other animal will have the biggest case of ground shrink than antelope.They all look big at 70 MPH