I havnt noticed any leading problems using nitro cards and fiber but I am using coated lead. I have made my own shotcups before but didnt notice any benefit in pattern so stopped using them. You can get a wad trimmer to shorten those steel shot wads, a 10 ga wad should be close in dimensions to a 12 ga hull so a 12ga hull trimmer would probably work. Really all you need for cutting slits is something shaped like a cross or t pattern as the petals should be cut equally apart. Oh yeah I just remembered I seen a guy just chuck a broad head arrow tip into a drill press to cut uniform wad slits.
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