I have started using 2.8 gr of Clays with a 158 gr LSWC. Mild load and very clean burning. Some guys don't like Clays but as long as you do not try to load it to maximum levels it works fine!
I am loading .40 for my S&W M&P using Berry's 165 Gr plated bullets with 3.8 gr of Clays (not Universal Clays). Nice mild load but still functions reliably.