Nathan,
As I said above I have the Chama. You would be surprised on how thin this shirt is.
I personally think it would be perfect for elk hunting. If the temp gets a little warm, you can unzip to vent and/or push the sleeves up. I have worn my Chama in mid 60 degree weather comfortably.
I have worn some of the synthetics with there "anti-stink" they do not compare to merino wool.
Give the owners of First Lite a call, (I think his name is Kenton), I have called him a number of times, and he is knowledgeable on his product along with competitors. He is a great guy, who is willing to answer any question you would have.
He can be hard to reach, however, everytime I have left a message he has called me back within a few days.
chris <><