RE: 50 bmg.
they are a lot of fun. My reccomendation has nothing to do with the rifle itself. My reccomendation is make sure you can find a long distance range to shoot it (500 yards at least). Shooting a 50 at 200 yards is like driving a Ferrari in a 20 MPH zone. It just doesn't cut it. And the 50's I have shot, really did not have very good accuracy out to 200 yards. Double that distance, and then it gets interesting. Good luck, and have fun.