Shooting back position or supline is much more comfortable than shooting prone. It is not that hard to get stable and when getting up after 22 shots I feel rested and my back and left arm do not hurt as they do when shooting prone with a sling. If one uses a neck-knee sling you are very stable and recoil is not a problem as it sonemetimenes can be from the prone position.
Cheers,
fallingblock

falling block