It has been a while, and I will show my SA revolver ignorance, but I thought this started as a 4 5/8 stainless Super Blackhawk, that Hamilton Bowen reduced in size:
http://www.ruger.com/products/newMod...eets/0814.html
The grip was conventional but Bowen reduced that as part of the work. Interestingly, there was no Scandium 329 when I did this, and this was an attempt to make a trim .44 field revolver.
I also have a Milt Sparks IWB and OWB holster custom made for it, but prefer the Kydex for wading and rough use.