I picked up a Model 10-8 4” in 357 Magnum, gun looks brand new. I have heard of Models of 10-6 & 10-7 in 357 Magnum but never 10-8. Anyone out there have any knowledge on this?
I'm aware that there were 10-6 variants in .357. IIRC, most if not all were made for NYSP. I do not recall any other dash models in .357, although it it not hard to ream the cylinder to get one. As far as I know, after these 10-6 variants turned out to have potential, the M13-1 came out and there was no M13 no dash.
Welcome to the S&W Forums. First, are you positive that it is a Model 10-8 and not a 10-6 with a weirdly stamped "6"? If it really is a 10-8, then I'm thinking it has been modified.
So a 10-8 with a barrel roll marked as .357 Magnum and the cylinder is 357 Magnum? Interesting. Hard to believe someone would go to that much trouble to convert a 10-8 into a Model 13, unless they started with a bunch of parts and not a complete revolver. Maybe a factory mishap with stamping the model number into the frame? Not unheard of when it comes to S&W revolvers.
As Stan mentioned, likely a mis-stamped model 13-2 or 3. Only a letter of authenticity would tell what the revolver was called in their records when it was shipped:
What is the SN on the butt? That would at least give an approximate age range and rule out whether it is really a dash-8 or a miss-stamped earlier series.