LOL!
I govern my own ethics on shots most people consider unethical. Myself? I know my limits because I shoot a lot. I mean a lot. Like Dan above, looks like he practices under hunting conditions. I love that. You prove nothing on the bench except refine your technique and how well you're gun is grouping. If you want to know your potential, practice situations similar to the real thing. Albeit there will be a lack of adrenaline, but the rest will come natural when firing if you've practiced it enough.
As for taking this topic's controversial shot... it's not controversial to me.
iSnipe