Thanks for the advice guys. I'll certainly take a look to see if I can find the book somewhere, or I might buy it online.
Now I seem to have my position a bit steadier than before, since I lowered my position by moving my sling attachment point forward a bit and loosening my sling. I also find that leaving my cheek on the cheekpiece while I reload helps keep my rifle on target.
However, I'm now faced with a new problem. When I reload, that's probably the only movement I make, but I feel that I'm making too much unnecessary movement. I always cant my rifle to the side so I can reach to reload, while keeping my elbows in the same position. Is this the right thing to do?
P.S. To an earlier post, I shoot with a one-point sling. I do match shooting only.