You could try a 3/8" arch punch but that will probably split the donnaconna wads), or a 3/8" straight sided hole saw in a drill press. Tinker here, and maybe Curl makes holed wads.

Francis Sell used to do this to improve his 20 bore goose patterns. The hole in the base wad held the shot together for denser patterns in the 20" killing centre. He probably got the idea from cheaters in the patterning contests in England,noted in Greener's #9 book. That's where I saw it first, when I got my book in 1977. Sell wrote it up in Gun Digest in the late 70's or probably 80's.

Personally, I used the gas check cups cut from spent WWAA12 trap wads. I don't know what else to use for a 10 bore other than 2 cards or 1 fibre wad. You could use a ball diameter that fits perfectly inside the top part of a 10 bore shot cup, with 12 or 16 bore wads beneath it to give the proper height for crimping.