You also have to remember listed loads take into consideration of guns that are 100+ years old. It would not surprise me if they come out with a Ruger only type load.
Brian Pierce wrote an article on loading the 44spl in several tiers based on the gun it was going to be shot in. You might google it and see if you can find it, it is floating around out there.
I don't load hot 44spl, I have a 44mag. I do however run it right at the max of what is published.
C M Brier CPA, CIA, CFE