The load all of my 223s have been liking lately is 27.8 grains of CFE under a 55 gr sierra blitzking, which kind of surprises me because I cant get them anywhere near the lands in any of them. I load everything to fit in magazines for hunting, going to try some ladder tests once the weather warms up some to tune the load a little for each rifle. Also going to try some Barnes bullets with the CFE to see how they do, looking for a little more sturdy bullet for larger varmints.
My 223s include sporter and heavy barrel savages, both 9 twist, an 8 twist AR and a 9 twist AR.