Reading the one where you compress BP, then fill, compress again and then put a ball on top and ram.
I found myself hugely skeptical (incredulous) that it was tried as you then have to compress already compressed power even more to get the ball below the chamber rim!
I have done that a couple of times reloading rifle rounds, kind of funny to see the bullet rise back up out of the case, not to mention you want someone else to have done it as you can get some weirdly wild ignition, of in the case of BP maybe none (no expert).