If a bowhunter can consistantly shoot good groups a 60yrds then yes;it would be an ethical shot.What would make that shot unethical is to not know your own limits and taking a shot you are'nt prepared to take.Me personally would not take that shot,but if I praticed hard and got to the point where I could consistantly group at that range then you bet I would take that shot.It is no different for a capable archer to take a 60yrd shotthan it is for a capable gun hunter to take a 700 + yard shot,it all depends on the person's skill that is doing the shooting.