Best Powders for the .223 Rem.?

[Okie Hog]

Decades ago I worked up test loads using several powders that were available at that time. I settled on IMR 3031 for my loads and still use it exclusively for all my .223 loads. My accuracy loads all use weighed cases along with weighed and sorted bullets. All of my .223 guns make <.5" groups at 100 yards using IMR 3031 and nearly any 55 grain bullet.