"Of course you could also just rethink the need for a unfluted cyl unless your pushing the envolope in 357 handloads."
This is why I asked about why he wanted the unfluted. The unfluted cylinder does add weight, it does not add strength. The weak point of a cylinder is the bolt notch on 6 shot guns. It is the thinnest part, and is the point that cylinders let go, and followed shortly therafter by the top of the frame. 5 shot guns (or 7, any uneven number) have the bolt cut offset between the chambers, and this is the greatest advantage strength wise over a regular 6 shot.
After the bolt cuts, the next thinnest part of a cylinder in the wall between the chamber and outside of the cylinder, or on some guns, the wall between chambers.. Fluting or non fluted does not change any of those dimensions.
The chamber length is the only real dimensional difference between 38 spl and 357 guns, tho most 38 spl guns do have shorter cylinders. Not required, but it makes the gun lighter to have the shorter cylinder. an unfluted, shorter cylinder would seem to defeat the purpose of a 38 spl cylinder if weight was the consideration.