For great reading on use of the sling as a shooting aid, check out Todd Dow aka Rifleslinger.
I have one of his slings, a modern take on the 1907. Works equally well on EBRs and blued steel & walnut.
His blog - https://artoftherifle.com/
His slings - https://rifle-craft.com/
His book - https://rifle-craft.com/products/shooting-sling-book
(at no cost other than your email address)
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