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The more savvy SMLE users who shoot long range targets will either move the butt stock swivel to the center position or install an extra sling swivel and screw there. You then can use the issue Webb sling to help steady the rifle.
When doing this, attach the sling to the front swivel as normal. Then, let it hang downwards, grasp the sling with your left hand and give it 1/2 turn to the LEFT. After that, install it (with this twist in the sling), onto the middle sling swivel that you put in front of the magazine. This way, the sling will lay FLAT against your left arm, rather than digging into it.
It is very fast to get into position with the sling this way. While standing, rifle grasped with the right hand at the wrist of the butt stock, flick and roll the rifle to the left while trying to keep it centered around the barrel axis. The sling loop will travel out to the right and when it gets out as far as it will go, a flick of the wrist to the left will send the loop of the sling flying back across in front of you to the left. As this is happening, you stick out your left arm, bent so the forearm is parallel with the front of and across your body. The extended arm enters the loop of the sling, the sling rides upwards on your left arm, and you roll your wrist under the front of the sling, then upwards and your hand comes over the top of the sling to grasp the rifle.
If you are fast enough, you can be dropping to your knees at this point, and the rifle butt will cushion your fall. Then, you are now in the prone position, steadied by a sling, and ready to fire.
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