Have a similar on going project at our weekend place. Had my truck tires replaced and then picked up a few more from behind their shop. Spent a few weekends clearing trees/brush and stacked and packed the tires in front of a dirt berm. Although is only about 12' by 5', I will say that there's another 1100+ yards of trees and brush on my property behind it.
View attachment 8474868
Then picked up a carport port that someone had taken down and proceeded to make some shade for a portable bench I had. The ties intended for the backstop were repurposed for that project. Set the them against some t-posts and drilled and drove rebar through each layer.
View attachment 8474869
View attachment 8474871
Neither the back stop or the carport are finished at this point, our dirt is about the same consistency as concrete this time of year, but the range is functional.
View attachment 8474872
Wait
wait
wait
You have another 1100 yards?
Time to start clearing for a longer range! backstops at different distances . . .