I have one of these. Slept in it down to 12 degrees in Co last year. I had all of my clothes on and still got a little cool, but not bad for a $100.00 20 degree bag!
I went on my first hunt OTC second rifle in colorado with 2 other guys. We killed two bulls. The first we worked our butts off for and the second fell into our lap. We learned two things, hard work pays off, and sometimes you just get lucky.
No way I would sit in camp. Glass or hike to the next glassing spot. Maybe if you know where a bull bedded down and you are going to come back after him in the evening but I would want to keep my eyes on him.