My impression is that slinging up is fancy move people would do when they are being fired upon. There is no safe distance in combat, and battle field is always dynamic. Slinging basically ties the rifle to your left arm. You can't use your left arm and the rifle for anything else when the situation suddenly changes. Hasty sling is a bit better. But I haven't seen any photos and documentary clips showing any soldier slinging when they firing their rifles in combat.
I don't sling when I shoot. I pretty much shoot my old guns to experience what the soldiers, on either side of the line, were doing when they were fighting during the great wars.
Thank you gentlemen for your input.
-TL
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