because he is shooting about 400 pellets, depending on the shot size used, he would probably hit the bulls eye over a 100 times , depending on the distance and the choke in the shot gun barrel, however the lethality would be less , due to the cutting edges on a good hunting tipped arrow.
your comment on blind archers is very interesting, and I have no doubt this can happen, this is one of the basis of contention in allowing blind people to have firearms, and is a big issue--- please elaborate if you have time.