Harold, I use the same recipe for lead and bismuth but allow for the volume difference by using the same type of wad but a lower profile as the bismuth is 10% or so more volume than lead for the same weight. As I am loading low pressure rounds I don't worry. Have actually tested some in 10 and 12 ga lead vs. bismuth and found very little difference. NOW, if you are loading rhino roller ammunition for geese or live pigeon, there MIGHT be some appreciable difference, I don't know. I long ago came to the conclusion good patterns kill more birds than blinding speed!
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