The Taurus 45/410 circuit judge is, from the reviews, a nice gun. However, the Rossi circuit judge in the 22/22mag configuration was an abysmal flop. This is a shame because the idea is a good one, but Taurus/Rossi executed the idea poorly. I would think the S & W could this gun and do it right.
I have a 22/22mag revolver that I like a lot; I can plink and I can hunt with the gun. Unfortunately when I went to get its match in a rifle I ran into a mess.
The reviews for the rifle revolver vary from ok to horrible; most toward the horrible side. The problem is that while Rossi resolved the blow-by, it made a barrel cone big enough to swallow a mag shell, up to 2 1/2 inches deep and so wide that the blast passes the lead and impedes the shot--to the point where the mag shoots at about the power of a regular 22 LR. Not good.
I wanted one of these but I am not willing to spend $600 for a good try. It seems like the idea a good one and that Smith & Wesson could do it right. The demand is certainly there since the internet is replete with reviewers who gave the Rossi a run.
And there is this: I think it's a shame that American gun makers would let other countries beat it to the research and development of fine guns.