Well old man, I am an old lady these days. When I wander from my heated Redneck Blind, which these days ain't often, I carry my rifle, whichever I have decided to take out on this particular day, spare ammo, (Although you. like Barney Fife should only need one cartridge) set of Vortex binoculars and a day pack. There are some natural supports you find out in nature, a tree used as a brace, a rock or log used as a support, with your arm resting on it, or a rock with the day pack as support or anything else I can find. People these days seem to not want to improvise. A pair of sticks laying on the forest floor can be picked up and used as shooting sticks and are just as steady if you know what you are doing as those $100 sticks you carry along weighing you down. Look around, you don't have to carry fancy supports around with you, Mother Nature has provided you with a variety of different natural supports. If all else fails, take your hunting coat off, ball it up and use it as a support. One thing though...if you do this make sure you are wearing a blaze orange, or in my case fluorescent pink shirt under the coat. Use your imagination and what is available. If you do you wont have to carry a lot of stuff with you. Keep in mind, some of us old folk were hunting before you were a twinkle in you Daddy's eye and didn't have all this modern crap to haul around. Use what is available, and if you don't see anything available, IMPROVISE!!!!!!"Rear Support" seems to be my issue. 600, 700, 800 yards I can see my heartbeat in the scope. I try to minimize holding on to the rifle. The Arca rail looks nice, but I believe supporting the rear of the rifle would still be my issue.
I'm an old man now and I'm not sure how i would do dragging around a super heavy tripod. I do have a Manfrotto/Bogen I could try!