For hunting, with the exception of deer/elk, my father only uses a .410 mossberg bolt action. He uses it for squirrel, rabbit, dove, even duck (or did before the lead ban). I've witnessed him take a couple of turkey with it. He may very well be one of the most impressive shooters I've ever known. But on his side of the bed sits an old Stevens pump 12ga. You can't possibly believe that the .410 is the equal of the 12ga in effectiveness just becasue the pellets are moving at the same speed. 22 lR is shooting at the same speed as well, but mass matters.
John A. Monroe, Never Forgive, Never Forget, Blood Pays Blood