It's hard to know what kind of information you are looking for. The 17-6 is a version of the Model 17 and the -6 engineering change added the full length barrel under lug and the new yoke retention system and the revision happened in 1990. In 1993 the 8 3/8 barrel was discontinued from the line up.
I have a 17-4 with 8 3/8 barrel and it shoots like a laser beam and maybe the most accurate S&W revolver I own. Most forum members would agree that S&W 22 revolvers are fantastic shooters and that can be verified by the large numbers bought by the members of this forum. I currently own 5 myself a K22, 17-4, 18-3, 18-4, and a 617.