There are so many "Clays" derivitives it gets rather confusing. There is the original Clays, Universal Clays, International Clays, Clay Dot, etc. They are all different powders with different burning rates, although Clays and Clay Dot are similar. These two are made by different companies. Clay Dot is a close copy of the original Clays from Hodgdon. Clay Dot is made by Alliant Powder. Most of the other "Clays" are made for Hodgdon in Australia, if my info is still correct. They are ALL good powders, but the ones from Hodgdon are made for different types of loads. Clays is the fastest and used for the lighter loads, as is Clay Dot, since it is similar. International Clays is a little slower and can be used in slightly heavier loads. Universal Clays is slower yet, and can be used in slightly heavier loads than the others. They ALL have applications for Handgun loads, but Clay Dot has very little data available, if any, for that application.
Check out the loading data at:
www.alliantpowder.com
www.hodgdon.com
Hope that helped!