All of my 45, 50 and 55 grain bullet loads for the .223 use IMR 3031.One of myanti-coyote loadsuses 25 grains of IMR 3031, an LCcase,CCI 400 primer and the 55 grain Remington PSP bullet. That load makes .5" three shot groups when fired from my CZ 527 American or my Sako. This is a compressed load.