For the newer hunters out there. . remember. . this is 3 dimensional.
We train on a 2 dimensional target and aim for "the spot". You need to deterimine where that spot is.
On a real critter, "the spot" to aim moves depending upon the deer's stance and your position relative to the deer. If you aim for that same practice spot at a deer that is quartering away from you, or at a deer that is close and below you (treestand shot) you are going to experience problems.
Think before you shoot. If you don't understand what I am talking about here, ask an experienced bowhunter to walk you thru it. Or ask the folks here.
CHuckC