That 3 screw been converted to 44 Special?
Yes, it has. It was an old Three Screw .357 Magnum. I lucked upon it several years aback seeing an ad in our paper. Bought two of these, one a 6 1/2", for $200 a piece. Both had the factory conversion in place and I was able to round up the parts to put them back into original condition.
The Ruger is now my everyday carry gun.