“An inexperienced shotgun user will check out a gun by lifting it to his shoulder and then putting his face against the stock and squirming around until he can look down the barrel or rib. A good shot will invariably pick out a target or imaginary target, push the gun muzzle at it, and then see just how the gun fits. He doesn’t thrust his head forward extremely far, but he endeavors to meet the gun stock with it.”

Charles F. Waterman
“Guns and Using Them”
Hunting Upland Birds, 1972