The Hodgdon data for IMR7977 is interesting, because it illustrates how the relative burn rate of powders can change in different applications. In some cartridge/bullet combinations 7977 charges are closer to Retumbo than H1000, and in others the reverse is true.
Which is probably relatively few companies publish burn-rate charts anymore. I do know quite a few handloaders who try a powder in one (or at most two) cartridges, then firmly declare, "The company's burn-rate chart is FOS." Just llike they do when some company's loads don't produce exactly the same results in THEIR factory rifle. (Of course, they generally don't use the same case, primer, bullet or seating depth used in the tests.)
Burn charts are just a very general guideline, not absolute.
