The 223 loads with imr 3031 Diaries
3031 is great stuff in a variety of circumstances, with all sorts of bullets, and 100gr Main Lokt's are nearly as good as any cup and Main bullet ever made, Nevertheless they were not designed for one another. It will function, although not the best. Its one of my greatest powders for all temps covered in maryland. i typically use it for 52 or 60g