The .50 caliber revolvers out there have to date fallen into two categories, super powerful rounds like the .500 S&W or less powerful rounds suitable for use in defensive revolvers like the .50 AE. Because I have an ATC I am always watching for ways to do it better, but the bulk of the X frame S&W guns I find unattractive, and the smaller .50 AE guns are underpowered for my needs. But there is a cartridge that can be chambered in normal size revolvers and promises lots of power, far more than is needed actually. That cartridge is the .500 Wyoming from Freedom Arms. The magic here is that the case is belted, and thus does not require as large a cylinder as a rimmed cartridge, although admittedly it lends itself to use in a SA gun better than a DA. If I was looking at a .50, that would be the one.