In magnum powders , IMR 4227 gets more use on my bench than any of the others . It's single based , the others are double based hence the reason for more recoil . It gives up a little in velocity but has excellent accuracy , esp with heavier bullets . Some have claimed accuracy fell off after numerous rounds . That has never been my experience . I personally believe they were blaming the powder for their own personal failures . Regards, Paul
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