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On their web site reloading data, IMR doesn't list 4320 in any load recipes for any bullet weight in 6.5x55 Swede, altho they do list 4350. Same with Hornady's manual. If those two, along with Lyman don't list it, I would assume that it is not the most appropriate powder to use in that platform. At one time it may have been, but either the formulation has changed, or other powders have been found to be more appropriate. I would e-mail IMR for the reason as I have found them to give quick and courteous responses to any questions I have ever asked them.
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