Thank you AJC1. I don't know about comparable short wads but I'll look; from what I'm reading, almost all 410 wads are the same design. And I didn't think about having to shave down the case....that could prove difficult.
Jack Ryan and Goon, I think you both missed the point. Jack Ryan, as I stated, I don't really want "another" shotgun. The purpose was to expand my AR-style family and perhaps shoot slugs from it...eventually. Goon, I'm trying to learn shotshell reloading....that's part of the fun. If there are longer magazines, I haven't found them yet, and I've looked.