LOL......I looked at the full sized one and the 4-6" ?? flavor of that beast the other day. I have a Ruger Bisley in .500 Linebaugh and enjoy it yet I'd be hard pressed to pull the trigger on that S&W 500........:o)
There's also this one.
http://www.firearms.smith-wesson.com/store/index.php3?cat=294735&item=831458&sw_activeTab=3