You're right about the s/n; it's N178xxx. Interesting that the shop I bought this at didn't know this, and my paper work has the 505xxx number.
Thanks for the Milt Sparks suggestion; looks to be exactly what I need.
This is my 1st ever revolver, so I'll probably be back with more questions, especially concerning reloading, but that would be in that particular forum. For here, is there an 'owner's manual' of sorts that you would recomend?