Harold
thats a reasonable starting point, but it should be noted that a 7/8 oz charge bar will not drop 7/8 of of bismuth shot because the densities are different. You probably know this already. Your eventual pressure may come close to the 1 oz load since the pellet counts are similar but it may exceed it too since the material properties of bismuth are different.
I spoke with Tom Armburst about this at length last year with the best intention of sending loads for testing, but I couldnt get all the components I wanted to base my load on. His advice was to start with the dgj load.
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