What likely prompted the change was the impact of the Western on both the Silver Screen and on TV.
Untold numbers of SAAs were refitted to .45 by their owners, because that round was readily available, and so were factory replacement cylinders and barrels.
If it's clean and in nice shape - you can hope to find a .38-40 barrel and cylinder commensurate with frame condition, and have them fitted.
Or not.
Untold numbers of SAAs were refitted to .45 by their owners, because that round was readily available, and so were factory replacement cylinders and barrels.
If it's clean and in nice shape - you can hope to find a .38-40 barrel and cylinder commensurate with frame condition, and have them fitted.
Or not.