I wish Winchester still made those cartridges. From what I've been able to find, they were last catalogued in 1989. However, it's really easy to duplicate this loading and I've loaded and shot thousands of them with the cast bullet version and small charges of powder. They aren't very loud out of a revolver anyway, so suppressed should be really subtle. They get the work done via sheer mass. Out of a revolver they yaw making a really big hole, but I'm not sure if they would retain this property out of a long barrel.