ORIGINAL: valor10
Not really. Gravity affects your arrow drop the same regardless. Think about it. You sight you bow in on level ground, then shoot at deer 20 feet up a tree, without having to resight your bow
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Um...not really...
Gravity does indeed affect the arrow drop the same but ballistically due to the difference between line of sight & line of trajectory an uphill or downhill shot will go high. As Arthur P said it doesn't have mucheffect until you get around 30 degrees (though there still is an effect) but a 10 yard shot from a 20 foot tree standisaround 30 degrees. That is, I think, the whole purpose behind pendulum sights.
So yeah, if you are going to hunt from a stand you should probably sight in from the same height.