I've used it in 44, 357, 357 SIG, and for reduced loads in 22 Hornet. It works great in the 44 mag. I've only had two problems with it. The first was high extreme spreads with light bullet 357 loads. Not an optimum powder for that so I quit using it for that application. The second is the powder is so fine it doesn't work well in some measures. If the tolerences are loose then the individual spheres jam up the works.
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