It would be interesting to see a comparison of Black Powder impulse levels due to various charcoal wood sources.
That could give definitive proof, but doubt it could be actually done.

Where does one specify "I would like my black powder to be from Coconut hull charcoal, etc" ?

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When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !