That's what I have, a Philadelphia Derringer. I know you are not supposed to use 4fg as a main charge but it's only 10 grains, besides, lots of people unscrew the nipple and dribble in a few grains of 4f to blow out a dry loaded ball.
In this short barreled pistol, less is definately more. It will stand 30 grain loads but you can actually see the seated ball near the end of the muzzle and you get BB gun velocities. Anything over 15 grains is mostly a waste of powder in this gun.
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