DF-
Thanks for noting this on a discussion thread.
I've been making my own cup-shaped over powder cards and donut shaped felt wads for years.
I use them in loading for my bore rifles, the donut wads sit under the roundball and combined with the cup wads they give great gas seal and consistent results.
I wrote an email to the folks at ballistic products a moment ago asking if they'd make cup wads and donut wads in 12/16/20 gauge sizes.
I'd be thrilled to simply be able to buy them in bulk.
Still, making them isn't such a big deal, not too terribly much work considering the great results.
--Tinker
Would you consider describing how you make cup-shaped paper OP wads? My book that described how to make these wads has "gone missing".