W-231/HP-38
I've used both in .45 Colt. They meter through the powder measure identically, they shoot the same, they are the same. If I had both today I would mix them thoroughly to make one custom lot. Buy whichever is cheaper or available. It's an excellent powder that I no longer use because of so many choices that are also excellent. Still, if I found a killer deal at the gun show, I'd buy it and use it again. What are you using it for?
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