I am of the school of thought that .454 velocities aren't necessary (nor the consequent recoil and muzzle blast) for effectiveness on game. When you start loading the .454 with heavy bullets -- 300 + grains, the recoil get get pretty snappy. I don't think it is on par with a .475 loaded to spec -- it's more sharp and fast but not as heavy a push. X-frames by virtue of their sheer bulk tame the recoil of the .500 S&W quite a bit so it's not really a good point of reference with regards to recoil. The various .50 Caliber rounds that fit in a "normally-sized" revolver can take you to a whole new level of recoil over the .475 IMO. I had a .500 Linebaugh on an SRH that was downright nasty compared to my .475 on an SRH, but they all pale next to my .500 Maximum, and I need not even talk about my .50 Alaskan as that is in a whole different league. My point is that there are steps up and over even the .475 for the true masochist!
I think if you load the Casull down and load it with heavy bullets (335s, etc.), it not only becomes manageable, but you could even call it pleasant and it will not leave you wanting more on big game.
