Propellant burning Rates changed?

much of this can point to the change in test procedure.
A copper crusher likely had some dwell time influence.
Piezo sensor will show you a trace from ignition to departure, eliminating that dwell time influence.
As technicians ran old loads through new gear, they likely saw some nail biting cringe readings that required data revision.
This shift created reduced max loads, giving the appearance of a faster powder.
 
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