Just an FYI, Hornady sells seater dies by themselves, so in my case I wanted just a 40/10MM seater die so I didnt have to adjust my .40 cal die that came with my set to do 10MM. Their sweaters are nice too. it's almost as nice as the Redding Competition seating dies. Now I have a .40 seater and a 10mm seater.
It is nice to be able to purchase dies individually, like from Hornady. The price per die goes up a bit, but if you simply don't need a whole die set anyway...