Holy shit! Some of you guys are carrying around a lot of extra crap!
Consume a good amount of calories before you head out. No need for coffee, or a meal during the day, take a few small candy bars, or energy bars. Leave the spare hat, gloves, spare socks, leatherman. Gallon and a half of water? If you are hunting desert in the heat ok, but big game in the fall? 20 rounds of ammo? Really, are you holding off a raiding party? How about 5 rounds, if you haven't got it done by then its not happening. Ditch the pistol and holster, if you've got a rifle, what do you need the handgun for?
I don't often hunt the later part of the fall, but in September in the mountains I carry minimal gear. Gear needed for handling an animal: knife (2), sharpening stone (small), cord or rope, handful of plastic bags. Water bottle and pills. Fire starting stuff: magnesium, matches, lighter. Rifle hunting I carry 5 maybe 6 rounds. Binoculars. Phone and Inreach.