The SP-101 is a fine gun. A bit heavy for my tastes, and stainless steel, which I don't like, but it's rugged and reliable.
The Raging Judge is truly an answer in search of a question. If you need a .410 shotgun, get a shotgun. If you need a revolver, get a revolver. Don't try to shoehorn the capabilities of two into a single unit. It won't do anything worth a damn.