I used to just load unformed 223 brass with my 223AI load and shoot. Now, since I found a supply of 1970's surplus Norma 5.56 ammo I just shoot them. They're too hot to shoot in a 223 chamber but just right in the AI. They shoot very well, for surplus ammo, averaging around 1 moa.
My 6mm AI is a little different, and I just shoot factory loads in it to make my AI cases.