I have a couple of The Ultimate rifle slings. From Ebay or somewhere online. They are made of a rubbery material, absorb bouncing and wont slip off your shoulder and can be worn as a double sling over both shoulders
There used to be a you tube video on them. https://www.youtube.com/watch?v=PL6iKhG5CJ0. That might be it.
I have found them very good to deal with and a good product.
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