Which is why I keep telling people not to trust burn charts.
Trust what your chamber tells you.
They're nice for making rough comparisons of similar powders but you really need to load with a powder under a variety of uses to get an idea of its personality. Charts and stats and tables of "data" are nice for a bunch of drunks quizzing other drunks at the bar on a slow Saturday night but, not for much else.
I went through a pound of Competition just figuring out how it likes to be loaded and how much empty space it needs to get going. Turns out, it's a tight, fast powder that doesn't like air gaps but is great for pushing heavy loads.