I have a question that I know has been asked before but I was hoping to get it answered again. I am going to CO for a mule deer hunt and when I am on the severe slopes in the mountains and shooting uphill and/or downhill how does it effect my yardage judgement? I have a rangefinder so if I range it at say 30 yards will I use my 30 yard pin or will it shoot like a shorter or longer distance? Thanks for any help I get on this.