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I have read in numerous sources that it is a myth that a longer barrel has anything to do with the useful burn rate of a powder. No matter if the barrel is 16" or 22" or 6" the powder used will be the same with all else being equal. This shows that your idea for use of a different powder because it is a rifle is not valid. I have not personally tested this and am not an expert in the subject, I am just relaying information.
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