I'm hunting a piece of property this year that is situated on the side of hill. The immediate area around the treestand is relatively flat for a radius of maybe 10 yards, farther out presents either an uphill or downhill shooting situation. Let's say it's conservatively a 50 degree incline to the area behind me, and they travel perpendicular to my set at approx. 30-40 yards if they are not coming to eat at the base of my stand. As an fyi, I do not own a rangefinder yet. I have been able to estimate range successfully for the last 4 years without one, and planned on buying one when I could. I just didn't feel it was an absolute necessity, and therefore have delayed purchasing one. Here's the history with my attempts on this hill so far this year. First shot is at a broadside doe at approx. 40 yards on the downhill side of the hill. I rush the shot, make a clean miss, and actually end up recovering the arrow from a sapling I speared in front and just to the right of where I had aimed. I know I rushed the shot, didn't get a good cheek/nose weld w/ the bowstring or my wrist, and consider it a lesson learned. A fox comes in on top of a downed tree at approx. 35 yards, again on the downhill side. Shoot my first arrow aiming at the 35 yard mark. Miss, and believe it sailed over the fox's back. Shoot two more arrows, once at 25 yards, and again at 20 yards. Miss both of those as well. I do not recover the first arrow. Thick hardwoods area with lots of stones and things to send that arrow off to never never land. Recover the second and third arrows buried in the trunk of a maple tree. Here's the thing. I know my aim was on because they are aligned perfectly vertical on the trunk of the tree about an inch and a half apart from each other. The tree was directly behind where the fox had been perched on the log, which tells me that my range must have been off, not my aim. Successfully harvest a doe from 10 yards directly behind my set. Still on the downhill side, but obviously a chip shot. She was quartered towards on this shot. Field dressing and inspection shows the arrow cleanly punctured the near side lung completely, the arrow continued through exiting a few inches in front of her far back leg. Another broadside doe at pretty much the exact same spot as the first one I missed. 40 yards approx. Based upon what I learned from the fox, I aim using the 20 yard pin. Cannot recover the arrow, cannot find any blood. How do I account for the grade when shooting downhill in this situation? To be honest, I'm not even sure a rangefinder would help me in this situation. Do they account for degree of incline or decline when giving you a range estimation? Unless the deer are coming to feed at the base of my set, they travel this corridor behind me at 30-40 yards. I would hate to have to pass on a shooter in the future, but I have zero confidence that I can be accurate in this situation. Any help is greatly appreciate.