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.
There are still some who insist a scope is not needed for the type hunting they do, ignoring the advances of the last 150 years in optical sights. (Even the ultra-conservative US Army has adopted optical sights.) The idea that in some special circumstances open iron sights or aperture (peep) sights might be more useful is not lost on me, but with the inevitable advance of age comes the reduction in visual acuity needed for using iron sights.
I believe that many who completely resist the idea of...