[maple_leaf_eh]

After reading the story at the link, the smart alec answer is the holes would be from whatever the range was templated for.

The range was obviously opened post-Dieppe Raids, and closed after VE-Day. Were any bullets found in amongst the muck? How about measuring the diameter of the holes? The diameter of a pencil would be light machine guns. The diameter of a 1/2" dowel would mean heavy machineguns and anti-tank rifles. The diameter of your finger or fingers would mean 2- and 6-pounder guns.