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It's a given that different powders have different burn rates and that can equate to time. By that I mean to generate the same pressure behind the same weight of bullet a slower powder will burn longer than a faster powder. This will cause a different rate of acceleration and it is my thought that once the powder quits burning the bullet can go no faster. Everyone knows that a given load will shoot faster in a longer barrel as compared to a shorter one but is there a way to determine barrel dwell time to optimize the powder to the load?