Alex, Is that your best shot?
That thar is a photo of a retired FOO Tech! He is merely outlining the "handspan distance measurement technique". This technique is used to judge lateral distance for correction to the fall of shot - The width of your first two fingers subtend 70 mils. He is just demonstrating "40 mils".
On a pleasant aside, Wild Bill MAY be in town in January. He usually shows up during the week, so SUNRAY may miss out on yet another Gracie's due.
Cheers,