lol I' ve hunted for the last 6 years with nothing but my 20ga. 870, and i' ve dropped just about everything i shot at, including geese. I' ve(or my dog) have recovered every bird shot, sure there have been a few cripples but only from a bad shot, I' ve had nomore crips than my brother(using a 12ga.) just don' t try to reach on out there to touch em. Only shoot within your guns effective range i would not recommend any shot further than 40 yards and thats the limit.
p.s. i shoot 3" #6' s or #4' s for ducks and BB' s for geese. load it up and have a blast hunting good shooting!