I recently purchased a Redhawk in 45 Colt. I will agree that Ruger builds a tank of a revolver in the Redhawk, as I have one in both 41 and 44 magnums. They have both been to the upper end of the spectrum with numerous loads through the 25 or so years I have had them, and they both still shoot just as well as they did when new.
As for the latest addition, so far I have only had a few test loads through it, but I really do not feel that it needs to be pushed much if any above 1100fps with any load. To start off with, it will already be punching an almost 1/2" hole in anything it hits, and no matter what this isn't going to get any smaller. I have already shot groups of around 3" or so at 100yds, using some home cast 300 grainers at only about 1000fps if that. I didn't have the chrono so I am simply guessing but the load data suggested around the 850-900 fps area for a 4" barrel and mine is 7.5". I will not feel a bit under gunned putting this one to task on a deer or feral hog once I get the load tweaked to where I like it. Using anything from a 230 - 300gr cast boolit, or even one of the JHP's like the Gold Dot or XTP, I feel this will be a very formidable hunting tool.
I agree that there are quite a few different revolvers chambered in this caliber, and some can be loaded up to pretty impressive loads, but as has been mentioned if you want to run a full throttle 45 caliber to magnum velocities, why not simply go with the 454 or a 460.
I hunt with almost all of my revolvers, and do quite a bit of walking to and from my stands, as well as stalking the thicker woods for hogs. It might simply be me, but I have never felt that the 7.5" RH's were an issue to carry during the course of a day's hunting. Now my 8 3/8" Raging Bull in 454, that's another story.
