I don't mean to be a pooper, but, in your article, you suggested that people shoot with a sand bag. My suggestion is to shoot closer to start (10yards max) and without a sandbag so that a person actually learns to shoot. A person needs to figure out what they are doing wrong and right. If they go through a routine everytime, they will figure out what not to do. Many hunters for example, make the mistake with modern guns and sandbags. When in the field, there is no sandbags to put a rifle accross to make that nice shot. People need to learn to rely on themselves first.
Nothing against the writer of the article. I am mearly adding my 2 cents worth.