Look again at the Cimarron site and go to the Artillery model. BP frame 5 1/2".
They explain the Artillery model came about after the Indian wars when the wore out 7 1/2" model original SAA's were returned to the armories, barrels shortened, and worn parts replaced. The Rough Riders (Teddy Roosevelt) used the Artillery model in their charge up San Juan Hill.
Mine is the Artillery model and I find this barrel length (5 1/2") just right, as Goldilocks would say.
LEO, NRA member, Native Texan. Shooting and hunting for over 45 years!