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The concept has been around for a while. From What I understand it is NOT a drop in type feature and although different cartridges share similar dimensions, certain combination would prove to be catastrophic. Phillips & Rogers is the manufacture of the Medusa Revolver and Colt was attempting to build the Millennium revolver (same concept) before they went bust. If you read about the gun, you will see that it is a special tapered chamber and the lands and grooves in the barrel are different.
In the case of the SP 101 there are a number of problems that WOULD NOT allow .38 Special/.357 Magnum to work in a 9mm gun and the opposite as well. First off neither case will head space in the others chamber. The 9mm case is larger than a .38 Special, so it should not even chamber in the 357 Magnum gun. A .357 Magnum is much larger than the 9mm, so the chamfer in the 9mm's cylinder will not allow the 357 (or 38) to chamber. And if there is no chamfer, they will probably just drop through the 9mm's cylinder. The Medusa revolver has a specially engineered extractor that solved this head space problem. And even if a .38/.357 fit a 9mm chamber and the cylinder will lock with the proper head space, there is the problem of a oversized cylinder. The .38/.357 cases will more than likely get stuck in the 9mm's cylinder or rupture.
Think that the bottom line is "DO NOT" attempt to fire 9mm in your 357 Magnum Ruger.
Robert
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