Stack tires of the same size up about 5 or 6 high, then put a second row behind the first and you have a pretty good back stop. We have these at the range and they are shot with 30 caliber rifles and you can pick up the bullets inside the tires.
If you leave the tires in place then you will need to drill holes in the side walls so they won't hole water.
Most tire centers will give you the used tires and good luck..
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