Never hunted the area but have hiked it a bunch. Certainly in September, but even in October and November, I would expect this to be a high traffic area with recreational dayhikers and backcountry enthusiasts. Quandry is one of the easiest 14er's and thus attracts bunches of crowds. Most of the hikers will remain close to the trail along the Eastern ridgeline that leads to the summit, but there are still plenty of others who walk the road into McCullough gulch.
Could still be reasonable hunting, but don't expect to be alone.
In the spring of 2007 I was the unfortunate recipient of an injury cause by a damaged carbon arrow that shattered on release of the arrow. I was in the yard going to take a few practice shots before dinner and the second arrow is the one that did the damage. That day will forever be burned in my mind. After I release what happened I made mistake #2 I pulled the tail shaft of the arrow out of my hand causing more damage.
Thank goodness that my wife was home and was able to...