I finished my test series with the CFE223 powder and 55grVmax bullets. CCI#41 primers.
1. The powder is a little temperature sensitive, the difference between 40degrees and 80degrees is a little over 100fps with it running slower as it gets colder.
2. It is reasonably accurate @ 50 yards from 25gr on up. To do 200 yards you need to load at a minimum 26.8gr. At this point accuracy is good.
3. With a 16" barrel, once your loads pass 27.6gr the powder doesnt get completely burned, velocity and group size suffer and fouling increases tremendously.
4. 27.4 had the best groupings with .5 inches @ 100 yards with an average velocity of 2980fps
5. Hornady 55gr SPSX (super explosive) will completely shred apart pretty quickly after leaving the barrel at 27.4. At 26.8 to 27gr it is running around 2800fps and is really accurate.
6. Dogtown 55gr FBHP bullets prefer a load of 27gr.
7. Armscor 55gr FMJBT bullets become inaccurate after 26.8gr
8. When you dont get all of the powder burnt, it really fouls your rifle to the point where you can see the fouling building up around the holes in your BCG. And it doesnt take very many shots to do it.
I am getting all of this on a spread sheet with graphs that I will post but this is a rough synapses of my testing with CFE223 and some different bullets. I still like the powder I just wish there was more reloading data for it. I feel I have narrowed down the range in which to load my rounds. I hope this helps someone else.