I'd love to see a picture of the Marlin, or a pic at the range with it. Those are a bit more scarce than the others, as originally, you had to be a Marlin stockholder to get one.
Try some #9's in the .410, as they'll have a more dense pattern.
Barney Fife: "Nip it, nip it, nip it!"
Andy Griffith:"Oh now Barn'...."