In my 12” X 12” X 12” box filled with mulch the bullets tend to migrate to the bottom and since I am shooting in the center the bullets look undamaged. I haven’t felt the need to harvest the lead yet but it will be easy to do. I am not seeing much mulch break up, I had imagined the need to keep topping it off.
There must be 20 places around here who sell the stuff, very good for pathways. If I were going to build an outdoor range without a concrete pad I would put rubber mulch on the ground, very good to walk and stand on.

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Ipsis Rebus Dictantitbus