Interesting article.
Ive long thought about setting up an underground shooting alley on our land here in Cambridge.
We are on the ancient Waikato riverbed so its all sandy and prebble down quite a distance under the grass. One big natural sinkhole.
Dig a open trench 105 yards long.2 metres in depth and a shade under 1.2 metres wide. the extra 5 yards you can widen for the shooting area for comfort.
Top with light framing and line the top with 7ply etc. 100 metres cost is 38 1/2 sheets @ $100 = around $3850. Framing and supports would be free as I already have enough for it.
Cover the ply with the sod you dug out and stick the sheep back in the paddock. Instant camo. possibly concrete pad halfway for tractor access.
No one would know what the hell you have there and the sod would mute the sound. no wind, and heat difference would be bugger all as well.
Hatches both ends for getting in and out of,accessing targets etc with small shed built on entrance.
Small extractor fan just behind the shooter to extract gasses etc
Small 1000 Gph bilge pump on auto would keep it dry.
Sort the lighting out etc
Cost would be f all.
Have to send the missus away on holiday whilst its being done though...
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