I have seen precautions for cleaning and bullet weight limits on Ti and Sc revolvers .Where can I find such info ?

I have a TI 41 mag and haven't heard about any of this

Do some searching in revolver forums .Sorry I haven't saved the links. The special coating on Ti cylinders, if the coating is damaged the Ti will wear quickly.Heavier bullets are better also. Care in cleaning - best is a nylon brush. Don't be one who wants to always clean to bright and shiney.
The S&W Scandium , remember that it's aluminum with about 1 % scandium.

My brother owns a S&W Scandium 38 he said the warning he got with it was not use to lite a weight bullets as they were more prone to move under recoil.