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I have since looked up some loads. There will be as much as 3 grains difference in charges of IMR 4895 and H 4895 for the same gun. A conventional 10% reduction to a starting load would probably take care of it but they are not the same.
The H is a newer formulation from ADI supposedly less temperature sensitive. But there are so many established loads with IMR that it really pays them to keep selling it.
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