I've heard that CFE223 is really nice in the 17's. I've gone with IMR8208 in my 17's along with the 204. Excellent accuracy and lots of forward motion.
Ive been using it in the .223AI and regular .223 and getting great accuracy and top speeds....I intentionally shot 40 rounds of it through the .17 just to see if it really did help with copper fouling, and it did. That said, the powder itself is dirty, comes out coal black...
