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I have some 150 gr. speer flat tips and the speer manual lists AA 2520 so Accurate arms 2520, I have Accurates A2520 and it's made by western powders. Is it like say Hodgdons 4831 and IMR 4831 that they are close but have different burn rates or are they the same? I tried to find out on the web but it's confusing so I thought so one here would know for sure. Dennis