I can't put down deer hunters for using them, But I hunt elk and there is no way I would ever use mechanicals on elk. Those ribs are too big to be bustin through with a mechanical. In fact, I wont use a fixed if it doesn't have an edge to the tip. Get an elk quatering away and its like trying to shoot through a picket fence sideways. Under the right circumstances I am SURE that you can kill an elk or moose with a mechanical. But I want to have the best penetration in all situations. Some of the bigger bulls are pushing 800-900 pounds. I set my bows to shoot around 270-275 fps, Two bladed fixed tune like a dream at these speeds. I can split hairs with my broadheads and they hit the exact spot where my field points do. If a bow is tuned properly there should be no differance in impact points. Next year I am planning on using the same set up on griz. Thats how confident i am with the penetration. And no. You are not unethical for using GOOD mechanicals on deer. But as ArthurP put it your are unethical for hunting with gear that you have not tested if that be the case.