IMR 8208 is the most stable and consistent powder ever created. Read the story of 8208 on the 6BR website. It will frequently read the same, repeat the same, velocity on back to back shots at nearly 4000 fps on my chronograph. My previous favorite power was VV N-540 for 40 and 39 gr bullets. I have also found it excellent in the 6mm PPC, easily competing with the "standard" of VV N-133 in the benchrest community. Using both 32 and 39 and 40 gr bullets it is also as fast or faster than anything else. I can get 3980 with 39 gr Sierra BlitzKings and 4250, yea you read that right, 4250 with 32 gr Hornady V-Max and Sierra BlitzKings. 26 inch McGowan barrel. The last time I shot was at 300 yds. 1.45 to 2.25 inch groups. I can do better probably with less wind. I have used 27 to 28 gr with the heavier bullets safely in Nosler brass. If I remember 27.3 is the listed max. I use HBN coated bullets so my pressures are mild. With the 32 gr bullets I think the 29 gr max has plenty of pressure. All velocities listed are at 12 feet.
I have used IMR 3031, 4064, 4895, Benchmark, H335, 2000MR, VV-N133, VV N530, VV N540 Reloader 15, H4895, 10X, With two different .204 Rugers. The powder I want to try is CFE 223. Anybody tried this ball powder?