S & W Forum has has pretty well beat it into everyone Callahan's weapon was a 6 1/2 like this . Just for info, not that it matters. There are some who think just because it was a movie , Harry never really capped those punks either . Cynical bustards .
LOL - "I just gots to know..."
Mine is an 8 3/8" - I should have seen the difference, but I haven't gazed eyes on my .44 for quite a while. It sits in the safe awaiting its next assignment. Or, I should say, its first assignment.