People are always hesitant to spend extra money on quality powders. I have run Vihtavuori powder for all my competition guns for a few reasons:
1. Very consistent metering in Dillon presses
2. Not temperature sensitive
3. Consistent performance on the chronograph
4. EXTREMELY clean
I have attached a picture of FIRED cases for a range session. They could probably be reloaded again without cleaning if I wanted to!