I am relatively new to the 300 BLK. Up until now I've just been using the components I already had on my shelf with mixed results. I've been using W-296/H110 and it performs well with supers. Not so much with subs. At 9 gr I am getting most to stay subsonic, but every few rounds I get a crack. Though I have had zero cycling problems, I am afraid to go lower. Way to much empty case volume. I've decided to just order a dedicated powder for the job. Everywhere I look there is conflicting info. Some say CFE Black, others AA1680, still other shooters World Black. I am loading Lee 230 gr PC bullets out of a 10.5" PSA upper with a Silencerco suppressor.