For my 100 yard (107 yds) range , I used the tractor auger to drill a bunch of holes for cedar posts and then built a wooden box around those posts to hold dirt. Having a front bucket on the tractor made dirt moving to fill the box real easy. The target backstop is about 5 feet high and 6 feet wide and maybe 6 feet of dirt behind the actual target. Behind all that is about 1/2 mile of forest. That's all the backstop I need for all those tiny
little groups I shoot. Groups that aren't tiny are due to weather or wind or changes in gravitational pull...or maybe sunspots.