If it is that flat,,
TRENCH,, at least for the short range,, You can get someone with a bulldozer or even a plow-blade tractor and just plow a trench 40-50 ft wide x 10-15 ft deep. use the tailings to build a burn around the target end.. Just look for a spot that is 30 - 40 ft above the water table,, so you don't create a swimming hole...
I have seen some good improvised ranges at streams that erode pastures, creating trenches that are almost perfect for ad-hoc target shooting..
An aside: I have use RR ties to line my drive-way, very common here,, about 5% of the ties have spikes and rail plates still attached.
Good Luck,, when your done,, let's see some pictures...
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Go raibh tú leathuair ar Neamh sula mbeadh a fhios ag an diabhal go bhfuil tú marbh
"May you be a half hour in heaven before the devil knows you’re dead"
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