« Reply #7 on: July 29, 2011, 03:41:31 PM »
I've seen tires used, and it depends on the caliber and load as to what might splash back. Remember that there are steel wires interwoven within the rubber.
I have seen portable back-stops made from old mud-flaps from tractor-trailers. They were layered alternately with old carpet remnants and suspended from an old swing frame.

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