Things You'll Need
Instructions
Loosen the sling's swivel at the butt of your rifle so that it is still attached but hanging loosely. The space between the rifle's front attachment and sling loop should remain the same, and only the back of the sling should be adjusted.
Make a loop that is wide enough to comfortably fit your non-shooting arm through. Do this by moving the belt buckle if you are using a leather sling or by simply adjusting the amount of slack in the sling if you are using nylon. The sling should now still be hanging loosely but with a loop in the middle.`
Slide your non-shooting arm into the loop you just made. The sling goes around the wrist all the way back to the space between your shoulder and bicep. You might need to experiment and adjust the sling a few times to determine what is most comfortable to you.
Tighten the sling around your arm with the arm not tethered to your gun. The sling should be tight enough to be incapable of sliding up and down your arm, but loose enough to maintain adequate circulation.
Hold the gun as you would if you were about to fire. The sling between your arm and the front of the rifle should be taut. If it is loose, adjust as necessary. Keep your support arm directly beneath the rifle and fire when ready.