James A. Moss, Manual of Military Training
“ What the sling does. It does two things: (1) It steadies the rifle, and (2) helps to take up the recoil,—that is, to reduce the "kick."Its use. There are a number of different methods of using the sling. Experiment with different ones until you find and decide upon the method best suited to you.The sling should be used in all firing,—combat practice as well as at target practice. [Pg 483] Always adjust the sling so that it will be tight.Have the arm loop no longer than is necessary to reach the middle of the small of the stock. ”
