You'd have to load with fiber wads or plastic with a filler. They now make a 3/4oz 20ga wad [ Claybusters ] . Half oz would be a 410 load. I don't know, but would there be a problem with the bigger volume and small amount of shot getting the powder to burn good ? Guess you could look up a 410 load and try it in a 20ga hull. Might be a dirty barrel indiacating a incomplete burn. Paul
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