The problem is there are so many variations of shooting. I like Jack O'Connors The Complete Book of Rifles and Shotguns and The Hunting Rifle. I also like Precision Shootings The Benchrest Shooting Primer. I also have enjoyed a couple of Jeff Cooper books The Art Of The Rifle and The Modern Technique Of The Pistol.
You know I read O'Conners book and I think it is a good text for the novice on shooting technique. Col. Cooper, well what can I say? I don't agree with all he writes but he does know his stuff for sure. As far as gun writers go I think the best on rifles I have ever read is Jim Carmichael.