I think Driverman's method is the the point blank range method. Google it and have read. Basically it gives you a range in which the bullets trajectory/drop is within the kill zone of the target animal. For a rabbit within the point blank range aim at the vitals and the path of the bullet will only diverge from the line of site by 0.5" and your rabbit is dead. It does obviously depend on ammo, rifle and height of scope so needs to be tested at the range.
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