Well, I think this is a dandy project. No need for a custom cylinder - S&W made 10mm cylinders for N-frames for the Model 610. Just order one of those and install it in your Mod. 57. You'll then have a "pinto" 10mm/41.
I think you guys are missing his point. I think he wants a revolver that will shoot the bullets without spinning them so there's no rifling marks for the forensic's guys to trace back...
![Wink](https://smith-wessonforum.com/images/smilies/wink.gif)
The 10mm bullet "gliding" along on the surface of the 41-cal's lands ought to still fly fairly straight for a little distance, and that's all handguns are good for, right?
Sorry, couldn't resist!