I tried CFE 223 in both my Grendel and a 5.56. Did not get good accuracy after trying several bullets and you really need to clean your barrel when you change from one powder to another as CFE leaves a residue that makes some guns shoot poorly for 20 shots or so.
I stand for the Republic and all who oppose me be cursed!
Location: 3 miles NW of Brownells retail store and they keep me broke!
22.5 grains of IMR4198 and a Hornady 40 VMax has killed a lot of Iowa Coyotes out to 300+ yards. I use it for spot and stalk or tracking a coyote. On windy days or towards the end of winter when the coyotes have wised up a bunch I take an identical gun only in 243.