Shooting a rabbit, or any animal, behind the shoulder angling away is immoral? It drives the bullet right through the chest, and the lungs being somewhat flat, gives a much better wound. Thus the angle. That is the preferable shot. Plus, it usually takes out the shoulder on the far side as well. Works with any four legged animal. With the shape and location of animal's lungs it is virtually impossible to NOT hit the lungs at an angle, with the exception of a perfect, I mean PERFECT, broadside shot. And if your up in a tree, and the deer is broadside, that is an angle(downward). And yes, bullets will make slightly larger wounds at an angle.