Just finished this, been working on it a while. It is designed to be used as a normal sling for your rifle, but once you need both your hands, say to drag a red or carry a roe you can easily lengthen the strap to go around your back.
Veg tanned 3.5mm leather throughout, sam browne stud to hold short, solid brass D ring to hold long and chicago bolts to affix to swivels.
£75 plus £5 towards postage please. My normal no quibble guarantee comes with this.