That's why I was confused Tim.
I found the pics, pulled down the frame, definately an SB2. I knew that the barrel markings were for the barrel only, and the serial number didn't seem to offer any clues. It's been a good rifle so far, shooting 45-70 and .44 mag equally well. I've taken deer with the 45-70, but so far the .44 has only been used for load development.
I noticed in other posts that the barrel length for .44 mag has been shortened to 18 inches. Why would they do this?? Mine is 22 inches and shoots laser cast .431 dia 240 gr bullets better than I can hold (with the open sights)
Thanks for the info guys
Keith