I like IMR 4064. However, I don't think it is ideal for .223 due to case capacity. I seemed to come up with compressed loads much sooner than the load data said I would. I even tried to use a drop tube to help, but I still filled up the case long before max load. I have not used it in a while for .223. I don't think my results were all that great either, but I did not shoot much with it. I use IMR 3031 quite a bit for .223. I have had good results with 3031, but I also experiment with other powders too. IMR 4064 is versatile though, so it never hurts to have a pound of it if you reload for various calibers, especially larger than .223. It works very well in .308.
Coincidentally, about 3 months ago, I did try to use IMR 4064 again in .223 with Hornady 75 grain BTHP bullets. I was loading multiple charges starting near min and going up to max. After learning my lesson in the past, you would think I would have know better. Turns out, I filled up the case long before max charge. I ended up pulling the bullets I had loaded and used Winchester 748 instead.....which I have yet to shoot.
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