I'm about to make a new sleeping bag purchase. I'm getting a bag for use in the NC mountains in fall, winter, and spring. I'm stuck right now though, with trying to decide between a Western Mountaineering Antelope SMF (5*) or a Apache SMF with overfill (10*). I was talking to Gary Patterson at WM, and he was saying that the Apache with overfill might turn out to be as warm for me as the Antelope, becuase it has a slimmer, more efficient cut (59" shoulder vs 62"). I'm 5'9", 150lbs, and he said I would fit fine in the Apache, and I don't need much wiggle room: often end up sleeping on my side. So, the Antelope has an inch more loft, but the Apache has a smaller space for me to heat up.
How much will the smaller volume affect the bag's warmth? Which bag do you think would be warmer for this skinny cold sleeper?(if the difference is negligable I may go with to Apache and save 5oz)
Let me know your opinions.
Thanks a bunch!