Get away from roads, .5- 1 mile, glass+ patience. I've had good luck hunting within a mile or so of irrigated alfalfa fields in dry years. Wet years, deer seem to be a lot more scattered. Don't over think it. Just get the tag and go. Broadus is very hospitable to hunters.
Hahaha the ballistic chart madness....3100 Will be easily done with the 143 and reloader 17... pick what you want, shoot it, nevermind what the internet minions drum up!
It is possible. It's physics. Nothing wrong with noslers, I've shot and will continue to kill critters with them. Accubond is my favorite bullet in multiple calibers. Let's compare a Barnes LRX 127 gr to the 143 gr eld-x.
If you run a 140 grain 3100 fps out of the PRC, it carries the same ft-lbs of energy out past 700yd as a 300 win with 180 grain @ 3,000fps.
That being said, I like 30cal holes when it comes to elk personally.