A friend had a Model 29 but I think I remember it as a .357... did they ever chamber the 29 in .357?
If it was a .357 it could have been the model 19.
Copy and pasted info. 29 686 19
The Smith & Wesson Model 29 is a six-shot, double-action revolver chambered for the powerful .44 Magnum cartridge, manufactured by the U.S. company Smith & Wesson. It was made famous by and is still most often associated with the fictional character "Dirty" Harry Callahan from the Dirty Harry series of films starring Clint Eastwood.
The Model 29 was offered with 4", 5", 6½", 8⅜" and, later, 10⅝" barrel lengths as standard models. Other barrel lengths were available either by special order from Smith & Wesson's Custom Shop or custom built by gunsmiths. The 5" barreled variant had a full length underlug. Finish options available included a highly polished blued or nickel-plated surface
The Smith & Wesson (S & W) Model 686, is a six or seven shot double action revolver chambered for the .357 Magnum cartridge. It will also chamber and fire .38 Special cartridges, as the .357 Magnum was developed from the .38 Special. The magnum case is slightly longer to prevent magnum rounds from being chambered and fired in handguns chambered for the .38 Special. The 686 has been available with 2-1/2 in. (64 mm); 3 in.(76mm); 4 in. (102 mm); 5 in. (127 mm); 6 in. (153 mm); and 8-3/8" in. (214 mm) barrel lengths as standard models and other barrel lengths either by special order from S & W's Performance Center custom shop, or acquired from or built by after-market gunsmiths. The Performance Center also made a limited number of 686 in .38 Super for competitive shooters.
Smith & Wesson introduced the Model 686 in 1980. It is the stainless steel version of the 586, which was a blued steel finish. It was chambered for .357 Magnum and .38 S&W Special +P calibers. They are available ported and unported with a choice of 6 or 7 round cylinders.[citation needed]
The Model 686 is based on S & W's L (medium-large) revolver frame. During the 1980s, Smith & Wesson developed its L-Frame line of .357 Magnums: the Model 581, Model 586, Model 681 and Model 686.
The S&W Model 19 is a revolver produced by Smith & Wesson on its K-frame platform. The model 19 is chambered for .357 Magnum. The K-frame is somewhat smaller and lighter than the original N-frame .357, usually known as the S&W Model 27.