535 !!! Knowing my personal limitations as a shooter, not a chance. Given perfect conditions at a range, I would not be confident at that range - regardless of caliber.
I started hunting with a bow, so when I started rifle hunting being able to reach out 200-300 yards was a whole new world. I would gladly watch my hunting buddy do it, and would expect him to hit it hard.
One of those old Army things - "Know yourself". I know that would be an irresponsible shot for me. One I would probably regret.