Just my $0.02, but there are some instances when it my be an ethical alternate to what is conventionally considered the killzone. But I have to say that I agree with the guy who asked why you would take a head a shot if you have a shot for the killzone. That to me is not ethical. If the answer is to save meat then you're completely full of crap because if know where you're bullet is going every time (and you should if you're taking head shots) then you're gonna damage that much meat. Unethical in most cases. just my opinion.