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There's a dozen of powders for the 223. The trick is finding one that gives the best accuracy in your rifle. I tried a lot of powder. A few times as little as a 5 shot group suggested "This isn't the one I need," an then gave the remaining powder away to an old deer hunting buddy that also is a home reloader.
In time I reduced the spectrum of 223 powders to two. AA-2230 & IMR 4198. Although those 223 powder experiments took place quite a few years back. Since then I haven't strayed from those results in my experimenting. There is likely a better powder made today but I'm happy with the two I found for my application.
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