I just started using a new powder...says it's made for the .223 rifle. It's Alliant Powder and it's called AR-Comp. I use 23 grains for a 55g Hornady bullet. I have shot about 100 rounds with this powder with no problems. Being that it is new there isn't any load data for it in the manuals, but there is on Alliant's web site. It meters very well in my Hornady LnL press
I was using Reloader 10X and was happy with it as well, but it is becoming harder to find in my area.
http://www.alliantpowder.com/product...r/ar_comp.aspx