I think it was designed for the 300 Blackout- BLKI thought it was designed for 223, and it's not even listed.
Im having good results with 101 gr Hammer bullets..2500 fps from a 14.5" p & w 28.6 gr of CFEBLK.It does very well with the 6.8spc bullets under 100gr.
Or anything else in rl7 / 1680 category.I think it was designed for the 300 Blackout- BLK
CFE223 is the one for 223's
Meters beautifully and super consistently out of my Dillon hopper on my XL650 300blk toolhead....I use it in my 300 Hamr but I freaking hate the stuff and wish there was a better option. Stuff has the consistency of sugar sand and makes a huge mess out of my reloading bench.