In the days of black powder the rule of thumb was a square load. If I remember correctly, whatever the volume of powder one would use the same volume of shot and the over powder card and wads would equal the hight of the powder or shot. You might try an over powder card and wad combination to equal the volume of shot in the 8 gauge brass case.
I have shot black powder in my old Parkers and they preformed wonderfully. You might give it a try, but have a dog or a spotter with you as you can't always duck the smoke to see the bird hit the ground.
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