do the math.....say lungs are 6" apart outside to outside. Say they are 8" high, 2" inside that leaves 4" in height to traverse in 6" of horozontal. Thats 2 to 3. 20 yard horozontal means 60 feet......how high can you get to still get a douple lung shot with your criteria?40 FEET (approx). of course that is leaving no margin of error

It just gets harder, smaller, as you go higher....for a ways