My wife asks me the same question along with why I need so many guns!!
I say different bullet sizes and trajectories for whatever you wish to hunt or shoot!
By way of repetition Big animals need big bores and the smaller ones less.By logic I did get the wife to agree that the best DG rifle would be a double vs a bolt.Now if I can just figure a way to use that same logic to tell her I MUST HAVE that engraved double 12 ga shotgun----
-------------------- An armed man is a citizen of his country, an unarmed man just a subject.