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we have 1 a. wide and 5 deep but it has trees at back and is open pasture land for a mile , no stock on it. i saw at the police range a back stop made of plywood on 4 x 4 8x 8 feet with gravel in between 4 in. thick. use to stop 223 and pistol. they just replace plywood patches when it gets to leaking gravel. i dont know about other cal. the thing is they are back to a hill. behind it. i am short on hills at the moment. thanks cjs
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