My 12 bore Holland Paradox regulates well with 23.5grs of Unique in a 2 1/2" old style AA Hull with a slug cast from the NEI Paradox mold. I seat the slug over a WAA12 wad with the petals removed and a 1/4" felt wad. I use a roll crimper to finish it off.

I had originally used teflon tape to wrap the slugs as outlined in Wright's book but found the bore would lead after 4-5 shots and cleaning them was a pain. I then discovered powder coating and the leading has disappeared.

My bores measure .737 and I size the slugs in a .735 push through die.

I'm getting 1040 fps with this load.