Ireadwhat the article saysaboutothershootersbeingable to make the plastic28 gauge wadbases fit, but with those oversizeddimensions,they dosound like they would be tight to load.
Maybe there's another option?
Why does a base wad need to be made out of plastic at all?
Folks haveoftenmade their ownwads out of hard felt (like Wonder Wads), milk cartons, playing cards or shotgun over powder card material,or harder or softer commercialfiber wads. Maybe some other kind of suitable gasket material can serveas a gas check in atrial runfirst to see if it helps,hurts or has no effect on your rifle'sperformance.
Either make apunch out ofa piece of copper pipewherethe edges have been ground down to be sharp enough to cut through the wad material you've selected, or buy a cheap set or a single punch and try experimenting with different materials to use as an effectivewad.
I would thinkthat a tighter wad would lead to some additional feltrecoiltoo.
Would the.50 caliber Wonder Wadsbe too expensive per shot for you to considertrying it as a gas check/sub base?