I hunt in northern california and our shots can go up to 100 yards so alot of my hunting buddies have sights up to 90 yards at 10 yard incs starting with 20. me i have sights up to 60 yards at 10 yrd incs from 20. so what im trying to say is start with just about the closest you think you will be shooting and go up from there. I would do 10 yard incraments because unless you have a lazer range finder you will only have an aprox distance adit is easier to judge by 10s not spesifics