So what you're saying is the bullet manufacturer is more reliable than the powder maker? Not trying to be a wise guy, I'm curious. Hornady's info is based on the actual use of a gun, Hodgdon uses a test barrel? FWIW, searching brought me info that the start load is closer to Hogdon, (higher), than Hornady. I know rcmodel has a fair amount of experience.
Consevridave, it'll be awhile, still have to build it. Bought myself a Christmas present, I've wanted an AR for a bit, finances mainly put it off. The finances have improved, I like to build stuff, I ran across a neat deal at my local range, TWS makes ARs, they also put together a build kit, all parts included. Seemed like the way to go, all the parts, they should all fit with each other. I can learn the actual build instead of figuring out that some of the parts I sourced from different places don't fit together. It's a 16" barrel, 1 in 9 twist. What problems did you have using CFE223? It was one of several powders I had on a list of possibilities, it was on the shelf when I went into the new Bass Pro Shop that just opened near me.