A lot of people think that revolvers don't malfunction. Like, it's impossible or something. I agree that wheelguns are inherently more reliable, and more forgiving of imperfect ammo, but... ... today I had a S&W Model 15 (K-frame, 4" bbl. police revolver, .38 spl) jam. The cylinder stopped turning after 3 rounds. It took nearly all my strength to pull the trigger for the 4th shot-- probably 25+ pounds on that trigger pull. The cylinder was difficult to open, too. The ammo was low-pressure 148 grain wadcutters. Remanufactured. THe fired cases looked normal. No backed-out or flattened primers. No defects that I could tell on the case heads or rims. I don't know what went wrong. We kept shooting the gun, and the problem never recurred in the next 50 rounds before the end of the range session.