I am from the Northwoods of Wisconsin and this is my 6 year old target backstop setup. Using 4 X 4 post that can be either post-holed into the ground or placed on a 4 X 4 stand for easier moving. I took 4 layers of carpeted and secured it to a top bar made out of 2 - 1 X 3 lumber in which using 4 - 3/8th circle bolts (two on bar and two on the header below the roof) and two S-hooks to hang the carpet up under the roof. I then took sheets of reinforced plastic and fastened it to a bar under the roof onto the 4 X 4 post to protect the carpet from the sun and weather. I then placed 4 bales of straw on top of a pallet in front of the backstop, in which I placed a 2" thick ridge foam insulation board on top of the straw. I then covered these bales in a few layers of plastic allowing the plastic sheet to be much wider then the straw bales. The wider plastic protects the sides from weather but allow the sides of the bales to open - which prevent the bales from rotten away. In front of these bales I place a single bale of straw which is also covered in plastic. On top of this bale I place my shooting bag on top of. My shooting bag is then covered with a two layer sheet of plastic, that I flip over to allow access to the shooting back. Again the plastic protects the shooting bag from the sun and weather. In front of this I have 2" ridge foam insulation board that glued together about 6 layers high and painted, again to protect it from the sun and weather. The only thing that I have ever replaced on this setup is my shooting bag. My friends or I never lose or damage arrows with this setup.
For fun we can shoot over 80 yards away from the target. So at these long distances it takes time to zero in onto the bag. It is also much easier to teach new shooter how to shoot, without having to spend the time looking for lost arrows.
In the winter, I use a snowblower to make a path to the practice range.
Hope this gives you some good ideas.
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