I load 2.6 g clays with a 122 g cast bullet & Fed. SP primers for cowboy shooting. I worked the load back slowly & never have any problems with this load. It seems like a very clean load. After several hundred rounds, my guns still appear clean on the outside. This load is accurate for me in my Ruger Vaqueros & S&W 686. Also in a 1873 lever rifle. I've fired over 1000 rounds in this loading.
This is a very light load, lower than the charts recommend, but functions well for me.