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I can`t find anything off hand with IMR4227 but I do see Hornadies #5 manual listing their 60 gr FP with 13.6 - 16.1 gr of H4227 in the 256 Win Mag. The Hodgdon powder should be a tad slower then IMR so you might try working up a safe load from the listed min load in your rifle.
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I must confess, I was born at a very early age. --Groucho Marx
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