I like CCI and Blazer. They burn pretty clean, Remington UMC isn't to bad either, then Winchester White Box. Fiocchi's are ok but make sure you get the ones marked Fiocchi USA. The ones marked made in Italy are very dirty. I also read on one of the forums about guy's having duds, squib loads and improperly seated primers on the Italian made one's.
Walther Forum Member #55