I always wanted to make an adapter for a pump shotgun to accommodate a 20 round drum. I generally don’t like loading one round at a time on anything. It annoys me when I spend more time reloading than shooting, which is why everything I have is magazine fed.
Let this thing develop a little further, and we’ll have drums before long
20 rd drum of 3” mag’s ‘00 buck? It would wear you out. But wreak mass destruction.