Charlie all you do is take a old 10 gauge hull cut it to the length you need and glue a nitro card in the bottom. According to my caliper its measure around the same as the SP-8 wad in diameter. I want to say around .820 or so, youll want to try some different slit patterns if you decided to tinker with them. I also made some shot cups from cardboard tubes as well but they were extremely hard to cut slits into.
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