Bulldog44,
I have a Uberti made American Arms Regulator. It came with a .44 SPL and .44 WCF cylinder. The .44 WCF cylinder has never been fired. Like Sample said, ammo is too expensive, and I don't want to reload it.
I use the .44 SPL cylinder a lot. In fact, it is my most used belt gun, I often carry it as my primary CCW piece.
Using my favorite .44 SPL load, 7.5 gr. Unique with a 240/250 gr. cast SWC and ignited with a CCI Large pistol primer, I can get groups about an inch and a half at twenty-five yards when I do my part. Sights do not look quite where the gun points (groups are about three inches right and about 1.5" low at twenty-five yards) but I've not gone to the trouble of barrel turning and sight filing yet.
Though not bad, the action really could stand the attention of a good gunsmith. Tom Sargis of Bozeman Trail Arms does a great job tuning Italian SA revolvers, he will also adjust the barrel for windage and elevation.
I like my Uberti and will probably buy another to give a matching pair, if I ever find time to shoot SASS matches.
Doc Hudson