Thanks again for the thoughtful and thorough responses! In regards to the questions for me, here are the answers:
@Nickziegler it is not guided by a professional, but some family members that live in Palmer/Wasilla area will be hunting with me and assisting. I will be taking a pistol in a chest holster as well.
@VernAK six decades of experience?! I'm sure you have quite the library of experiences and stories! In regards to the shot distance, I totally understand. I honestly don't think the people I'll be hunting with ever shoot more than a 100 yards or thereabouts. I only listed the 600 yard range because I've shot elk at greater distances than that and figured it would be an absolute maximum for everyone to consider in giving me feedback.
In the experience of those who have shot animals with the Barnes bullets, do you have any data on what the approx terminal velocity was for your kills and were you able to recover the bullets or verify the exit hole diameter to see how much expansion there was?