So far nothing has been as good as RAL 6018, but there are literally thousands of options out there so the dozen or so I've tried are just a drop in the bucket. My best results have been with "TGIC Polyester" powders from PBTP.
I just started working with a "Bottle Green" from PBTP; it seems to coat well but I haven't used it enough to say any more than that.
I can say the Harbor Freight powders aren't really worth messing with. You can make them work but they are far from ideal, and not worth it to save a couple dollars.
I've also had bad results with the candy colors; they coat well but bullets stick together too badly, and they don't seem to offer as much protection in the barrel.
