Not everybody can accept the penetration of buckshot or slugs in their home. A miss in my split plan home puts rounds in my son's or mother in law's room or my neighbor's kitchen. Remington has loaded a Duplex load of 6x4 or 4x2 for years, and Federal used to load a copper plated #2 birdshot shell in their Personal Defense line. The Federal had a spreader wad, though. I got poor patterns with it. I much prefer the Flite Control loads to put more pellets on target. The Remington Duplex loads I have were for duck hunting and were in OD green hulls with black plated bases.