A significant issue at the present time that makes reloading 20ga bismuth difficult is the fact Remington SP20 wads are not currently available. If you go on the Hodgdon On-Line Reloading Data Center you will see that almost every 7/8 ounce or 1 ounce loadings of bismuth calls for that wad. There is no telling if we will ever see that wad in production again with the Remington bankruptcy and Vista buyout.
Personally I would not have a problem taking a 7/8 ounce lead recipe and substitute the same volume of bismuth shot. It should be close to 3/4 ounce and from what I have read substituting bismuth in the same volume NOT weight will yield a similar pressure. If you are concerned about that approach you can have the load tested.
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Progress is the mortal enemy of the Outdoorsman.
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