I load Clays and shoot CAS every Saturday. I use 3.0 gr of Clays with 125 gr TC lead bullets. Clays can be temperature sensitive if you load way down on the low end. That's why I use 3.0 gr instead of the 2.6-2.7 that some other shooters use. I also make sure that the crimp is tight. The extra powder and a tight crimp has overcome the temperature variability for me. I shoot about 8,000 rounds a year in competition and this load works well.I used to use it for a cowboy load, but have switched to VV N320 for that, as Clays was irritatingly position and temperature sensitive in the long .38 Spl case. Never quite knew what I was gonna get when I pulled the trigger.
I still use a lot of it in .45 ACP, though. My main load there is 4.3 grains of Clays under a 200 grain LSWC. Just makes Major at any temperature I'm likely to see a chrony.