I took my previously flawless M605 SS revolver out today and loaded it up with Winchester 130gr FMJFP 38spl loads. It would NOT cycle. Cylinder jammed and would not turn, single OR double action. Couldn't see why. Tapped it a couple of times, opened and closed the cylinder and nada. Then it finally decided to work and shot without issue for about 75 rounds. No weird ammo, just stock Winchester ammo off the shelf. Gun was clean - I'm anal about that so not an issue. First time ever!!! Took it home, looked it over and cleaned it up. Again, nothing. Anybody got any ideas or opinions?