Blues Bear,
Thank you for the kind words.
If this works, here you go.
Brass shells shoot well in almost anything, but are easier to reload for non-repeaters, as the crimp works the brass excessively, and sizing is not usually done. (single and double barreled guns)
Load the nitro card wad over the powder, then the cushion wads and after the shot use a thin over shot wad, glued in traditionally with sodium silicate, water-glass. Now you read of Duco cement, but white glue is even cheaper.
There is no need to load clear to the mouth of the case, and wad column is not critical, but the more the better as it helps mitigate pellet deformation.
Newspaper makes a fair cushion wad, and one size fits all. It was in common use in muzzle-loaders.
Eleven gage wads and even ten are used in 12 gage brass or zinc hulls.
Brass shells are not usually sized, and are generally loaded with tools that would make a Lee Loader look complex. With black or bulk smokeless powder, the shot scoop is the powder scoop, but not with dense smokeless.
Black powder itself is not especially corrosive, and the old mercuric primers weren't either, though they amalgamated into the brass, destroying it.
Cheers from Darkest California,
Ross