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I have a pound of Alliant power pro 300mp that's supposed to give more velocity than h110/w296 for magnum cartridges according to Alliant. I've only used it for 30 carbine loads because I like 2400 the best for 357mag but you might want to check it out if your looking for a hot load and can find it. Handloader magazine did some testing with impressive results. It looks a lot like h11/w296 but it's supposed to be a little slower.
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