hmmm...don't have that much experience with the 223 as I grew up shooting a 222. Having said that I made up 500 .223 loads for some friends with a mix of 50 grain projectiles.

25.5 grains benchmark
Remington case
cci primer
50 grain vmax, ballistic tip, and ballistic tip lead free.

both 223s that I tried this load in went sub moa including my 8 twist ar 15