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Old November 28, 2012, 09:14 PM   #15
Jim Watson
Senior Member
 
Join Date: October 25, 2001
Location: Alabama
Posts: 10,930
Fake powders like Pyrodex are figured on volume measure.
The load would be however much Pyrodex filled a measure that held 70 grains of FFg.

As Salvadore says, Trapdoor barrels run large. You need either a large diameter bullet, a hollowbase bullet (like 1873) or a soft bullet bumped up by real black powder.
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