I don't have any personal experience, but the range I use has what appears to be "shredded tire mulch" stacked against the back wall. The building is in a downtown area and the range has both pistol and rifle sections, so whatever they're using works well. You might try calling them- Bullseye Indoor Range in Lawrenceville, GA. It's also a gun shop, so it may be difficult to find whoever takes care of the range. If you don't have any luck, PM me and I'll ask next time I go there.
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