After qualifying a retired officer, I shot a bunch of .38 Special through my S&W 642 (test fire after installing the "plug") and Ruger Blackhawk (test firing a new acquisition). I didn't have any .357 Mag loaded up for the Blackhawk.

Cleaned and deprimed all the .38 Special I shot, and about 100 cases of .357 for loads to be shot in the Blackhawk.