so what you are saying is that you have first hand experience killing zombies?
The difference between skeet shooting and zombie fleeing is that when you skeet shoot.. nothing is trying to kill you.
it wouldnt be about the power of the weapon, it would be more about its efficiency. That is why having a side arm and a 8lb assault rifle would be ideal. If you can aim like you say you can, under pressure with a chance of losing your life, why the fuck would you want a shotgun? All a shotgun is doing is putting you closer to the target, which in this scenario would be stupid.. why put your self in any more danger then you need to be.