WOW! Once in a lifetime is probably pretty close for a guess! Good luck, and don't forget to have someone along who will video the whole thing, from leaving your front door until you return. Make sure it's someone who knows what to video and that you trust knows how you hunt and what to do in close proximity to elk, and you will end up with a priceless memory saved forever! It's going to mean extra time spent shooting the background footage and plenty of possible headaches when the bull is 30 yards out, but it'll be worth it in the long run. Good Luck!