I had a fellow let me shoot his in .454 once. The gun seemed very well put together and very stout. The grip did a very good job of soaking up the recoil and the accuracy was top notch. I got to shoot .45Colt wimp loads, heavy loads, .454 lites, and heavies. With lite loads it handled like a pussycat and with the heavies it roared like a lion. The gun had a concussion wave that was truly wild with the .454's. I'd never shot a .454 before so I don't know whether it was the round or the porting but my guess is the porting took it to the next level.
The .44Mag is my heavy choice and that is also available in the Raging Bull. I'm a Ruger man so I went with the Super Redhawk for my hunting revolver but I have nothing against the Raging Bull series as I think they are the best made Taurus products.