I used to use ceiling Pinex. Can you still get Pinex though? Mate had a special 12g cutter that you put in a drill press for making wads.
IIRC I had one thin stiff overpowder wad (cut with correct sized wad punch) followed by 2 Pinex wads, one dry and one lubed. I lubed the wads by dunking them in a hot sausepan of cooking oil (crisco?) of some sort.
Same thin stiff wad over the shot. I gave up roll crimping or folding and just ran a track of pva glue around the outside of the over shot wad. Although the pva doesn't stick well to plastic hulls I never had a wad come loose in the second barrel (and all the shot rolling out of the barrel) when firing the first barrel of a double barrel shotgun.
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