I don't quite follow this part Chris...
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You would mount the sling to the rifle , loosen the lower loop , place your foot on the sling , and raise the rifle till the sling was taut. Use a clinometer ( usually from your local MG crew ) , find the three places your foot needs to be on the sling in order to have the sling taut while the rifle is angled at 30 , 45 , and 60 degrees . Mark those points on the sling with strips of white adhesive tape ( usually from your local medic ) . By placing the butt toe on the ground and your left foot on the proper strip and bringing up the muzzle til the sling is taut , the rifle would be angled at the choosen number of degrees.
If you had the time , you could dig a little trench so that the full butt plate ( or a good part ) would contact the ground to help prevent splintering.
Chris
No , because this was preping the gun. In combat you estimated the range , refered to the charts if you needed to , slipped the grenade on as far down as needed and chambered a cartridge , then just step on the sling where needed and raise it tight , lay your windage and fire . The M15 sight was about as fast and a lot more precise because of the spirit level .
Chris
In the 50's a frend was trained by WW2 combat vets.
He related that the vets could drop a practice grenade in a 55 gal drum at 200 yards.
At least that was his story
It was no problem to drop practice AT dummies into an open convertable at 100 yds and most of the time I could pick the seat on a bet. Was not real hard at all. I would bet a trained vet could do it at 200 , so the story is quite possible on a calm day ( we don't get many of those around here ) .
Chris