Go with cysto's advice.
Having a backhoe and dozer will get you a 20-30' wide area in no time. You can set your distance, then do staggered berms set for say 25-50-100 and 200 or 250. Or just berm it back X yards and range out targets at appropriate distance.You should have 20' high berms and consider sand or soft dirt from the berm back towards you approximately 50-100' to minimize ricochets.
The biggest thing to consider when doing the range, would be who and what are within an area should a round become stray.



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