Never weigh Triple 7. Measure it with a volumetric powder measure. Because it has a different density than real black powder, it's scale weight is not going to agree with its volume using a powder measure. Going by weight will result in serious overcharges.
This also goes for Pyrodex and other fake black powders.
They were meant to be measured volumetrically. The only exception is the black powder cartridge data for Black Horn 209 where they specifically say that the charges are by weight.
The muzzle loading data for Black Horn 209 is by volume however.
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