that's a good poke of a shot.
i've heard stories of guys killing with a bow at much farther distances, but even if the story is credible, why take the shot. i wouldn't count 45 yards unethical, but past 60 yds, you have a lot to contend with such as penetration problems and lack of suffiecient energy.
i routinely push my limits when i practice, sometimes at 80 yds with my recurve, and it helps me concentrate on my form, but i would never take a shot at an animal that far away.
just remember, bowhunters are supposed to be close to their prey! :thumbsup1: