Part of me is tired of thinking about why it works, and all the debate and theorizing about it.
It works,,,, when loaded as originally described.
However, if we coukd find out why it works, maybe modifications could be made based on circumstances.
Even if it could just be determined if it is the weight/mass of the lubed cushion wad, or is it all the lube being spread down the bore ahead of the shot?
Circumstances. A friend can't get cushion wads. If it is the weight, he's kinda screwed for this to work, if it is the lube, a couple heavily lubed felt wads in place of the cushion wad should suffice.
I personally think it is neither and both at the same time. Neither and both.
I think the results come from more than just the lubed cushion wad.
When I tried it with my usual, powder,thin overshot card, lubed felt wad, shot, thin card, then added thr lubed cushion wad,,, results were not as advertised. When I accidentally tried it without the thin card between shot and lubed cushion wad,, results were not as advertised,,, however I did see and improvement in how even the pattern was,,, it just wasn't as dense.