any scrap plywood or OSB, 2"X 2", drywall screws, 1 1/2" and 3 1/2", plastic shipping wrap 6 large garbages to fill a 3'x3'x18"----24" box or 4'x4'x18"----24" box and a old thick hay tarp on each side with a thick Costco in front of that on both side. What also works good behind the tarps is old commercial rubber roofing. We have been us thick fertilizer bags cut into squares for backer also.
This last target I built, I charged $160 for, bought one sheet of 3/4 CDX plywood, 2x2x8, #8 gun nails and 3 inch heavy decking screws for each corner. 1 5/8 gold drywall screws, 1/2 inch CDX plywood cut into 2" strips to go around to tarps and hay tarp backing (behind the costco tarp). Stuff these as full of shrink wrap and boat wraps as they will take, my skinny 14 year son jumps on the plastic to compact it.
I need to make a short video showing how we make these.
