Robert, I feel you make a very good point, I may try it, this year. Last year I went from shooting 4 pins to shooting one. Did I feel I was being unethical? Heck no! I practiced my butt off learning how high or low to hold the single pin, it became natural before season opened, my first kill came at 22 yards and to be honest I don' t even remember aiming!

Ethical is what you have practiced and know you can do, which is exactly what you were saying, if you practice enough without sights at all it is perfectly ethical!