I find this thread quite interesting. I have both a Ruger Red Hawk and several Ruger single actions. Carefully, reading between the lines, and with little care as to Ultimate Strength of either platform, it is obvious to me, that either platform is plenty strong for any "REASONABLE" load in either .44 Magnum OR .45 Colt.
My needs have never put me in a position where I have any desire to blow up any of my revolvers. I HAVE used 'Ruger Only" loads but there is little reason on my part (even when I was younger and hunting actively) to use those loads in great quantity. I think the prudent thing to do, with either platform, is to simply reserve those loads when NEEDED for seriously Big animals. Either platform will handle "Ruger Only" loads and I have NO desire to exceed them. So, Ultimate Strength becomes moot to me.
Just sayin'...
Now, having said that, I am grateful for those willing to explore the limits (so I don't have to) and give us better performance than the manufacturers will give us. Elmer Keith, Skeeter Skelton, and John Linebaugh come to mind...
These days, I admit that Brian Pearce's articles as well as John Taffin's and Max Prasac's books (as well as others) have been most helpful to this ol' shooter.
Dale53