A while back I came to these forums in the effort to pick out a good shotgun. Well, I succeeded. I purchased a Remington 870 Marine Magnum. For the last two weeks, I've been getting used to it. It bruised my shoulder the first day I shot it. Anyhow now that I am fairly comfortable with it, here's what I want to do. I am looking to truly learn how to use a shotgun. Home defense classes, night shooting, tactical shooting, and whatnot. I live in las Vegas, Nevada. Do any of you have suggestions?