If you have any questions about the Fusion bullet on elk, search for a thread here regaing a 338 Federal on elk. If I find the link I will post it.
Bottom line is that the bullet will work just fine on kill-zone shots, the only ones to take.
Here it is:
http://24hourcampfire.com/ubbthreads/ubbthreads.php/topics/3138764/1