I have been reading a lot of threads about stiffening up the stocks of these rifles. Any tips on what I can do to make the factory stock rigid enough to work well with a shooting sling? I am dead set on using a shooting sling. Recently lost most of my upper body strength due to an old neck injury. I like to shoot offhand, and the only way I can hold a powerful rifle snugly enough to manage recoil (or probably even hold it steady) is with a tight sling.