Would you call it unethical to shoot a deer without a scope on your gun? Of course not.Go practice with that gun from 80-100 yards with no scope and you`ll see it`s not easy,then come see me and I`ll put my bow up against that gun anytime.
If you practice enough with that gun you might win that bet but the point is-all this talk about 20-30 yards could be just a lack of practice,I understand a deer could possibly move in that less than 1 second it takes for my arrow to travel 80 yards,but at the same time a deer could hear your 20 yard shot and jump the string as well.