Not to stir anymore controversy but isn't hevi shot 10% heavier than lead it would seem like 10% would give u an advantage but not what many claim have in your opinions 7s really changed from what was commonly though of as 35 yard pellets to 50-55 with only a 10 % increase in density. Logically you would think efficiency would increase 10 % or 3-5 yards but obviously there are other factors in play. Just seems like a big jump when at the root it is still only 10% denser