It costs more than a $10 e-book, but if you really want to learn to shoot a .22 rifle, spend a weekend at an Appleseed shoot. Best rifle training available for the money, and a ton of fun.
Jack has a lot of irons in the fire, so I wouldn't hold my breath on him finishing any of his in-the-works books anytime soon. He's got tons of great ideas, but at times he seems to lack a little on the execution before he moves onto the next idea.