My favorite 223 load is a 55 grain Hornady spsx bullet loaded with 24.0 grains of IMR 3031.I load them in either Federal or Winchester brass and I use WSR primers.This load gets groups between 1/2" and 3/4" all the time.I have also had good results using the 60 grain Hornady sp bullet and 22.5 grains of IMR 3031.
