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Burn rates can actually switch places depending on the capacity of the case in which you are using it. The main purpose of a burn rate chart is to find other powders that may work in place of the one you are using. However just because two powders have similar burn rates does not mean you can use the same data for both.
IMR 4451 is a newer powder in the 4350 range that is supposed to have additives to reduce copper fouling and reduce velocity variations over large temperature ranges. You must, however, use data designed for it. Identical powders will usually have successive listings on a burn rate chart. Because one power is listed just ahead of another does not mean there is any significant difference in their burn rates, or in other cases that they are the same. Different charts put some powders in different orders depending on who is doing the testing. The chart is just a starting place.
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