I would rate the Freedom Arms at the top. But not the scaled down model 97, the full size original frame. The scaled down frame is for smaller rounds and lower pressure .45 ammo. Next the Uberti in this case. I like it a lot, my only question is how will it stand up to .454 pressures. Then the Ruger. Not that the Ruger is a badly built revolver but the other two mentioned are made for an extremely high pressure cartridge and have had much more time in building and fitting. The 5.5 Bisley Ruger is a favorite of mine. Original .454 loads were made in .45 Colt cases on .45 Colt guns. They were modified cases and guns to be sure, but the case only lengthened to not fit in the older and weaker guns, the cylinder length dictates the load limits not the case in this situation. I like the roll engraving but it's a matter of taste, I guess you could polish off the scene.
I have heard that the double action revolvers are not standing up well to very high pressure loads. With sticky cases and bulging chambers. I have noticed that .454 Casull loads are well watered down from the original loads when the big Freedom Arms revolvers came out. I bought mine in 1989, and they started production in 1983 as I remember. But it seemed when others started chambering the rounds, pressures went down. I have some original cases and they are hardened and with small rifle pockets, they do take loads that will stick .45 Colt cases and swell them. This is not a round you are going to use double action anyway if loaded hot. The only place I saw the advantage of the .454 over the Blackhawk .45 was extreme top end loads. And these are not something you want to shoot that often. The accuracy of the Freedom Arms is something else, competing with good rifles at long range. I haven't used the Uberti enough yet to say much of it's accuracy. The newer Blackhawks with reduced cylinder throats are quite accurate, more so than the older guns. Pre about 1996. I hope this helps.
I find the single action carries and handles bettter to me than a double action. The 5.5" length you mention is the nicest of all in my hand. I may do just that to my Uberti. The Tornado doesn't seem to be easily available in Canada and I've only found one guy using one in the US, in Alaska. Freedom Arms revolvers are everywhere in Alaska. I think a Uberti dealer should be able to get you one.
