In my "early days" (all recreational stalking), I zeroed my rifle at 100 yards and just took the very straight forward 80 to 130 yard shots until I built confidence (doable on a lot of UK Roe stalking). I don't think this would be a bad way to start. I did get a cheap range finder, used it to test my self, I have an out door job, left it in the truck testing my self daily on guessing ranges then confirming with the RF. seemed a good way to learn range as a beginner.