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Howdy
First of all, Trailboss is not a Black Powder substitute. It is a Smokeless powder and has pressure curves like other Smokeless powders. If it was my antique gun I would be loading it with Black Powder loads, period. I guess I should ask, how old is the gun? I am not familiar with Bulldogs, so I don't know when they transitioned to being safe for Smokeless loads.
Second, what would be the point of adding 'a pinch' of Black Powder to your Trailboss loads? The point of Duplex loads was to use the easily ignitable Black Powder to help ignition with some of the very early Smokeless powders. Modern Smokeless powders do not need such an initiator, they ignite fine all by themselves. Of course I have to ask, where are you getting your data for Trailboss loads in your ammo?
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