one of the most critical things for shooting at steep angles is your shooting form. you must keep your upper body the same as you do on level ground. the way to do this is to bend at the waist. do not lower your sight to the animal. draw your bow and then bend at the waist to bring the sight to the target.
may of us eastern treestand hunters have known this for many many years. if you do not keep the same shooting form your shots will be way off even if you use a rangefinder with angle compensation.
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