When I was looking for information on loading black powder loads for use in a twist barrel double in very good shape (12 gauge), the guys at Hodgdon told me to use about 80 grains of FFg in a AA case with a standard 209 primer, the Winchester white wad for 1 1/8 oz of shot, drop 1 1/8 oz. of shot and crimp it. It did work fine.
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