Axcept they would cost $20 per shot minimum... and kick butt on the back as much as the front... I was thinking these...
...in a full tungsten construction pushed by a hot and heavy load of powder would be "severe duty" and surpass the numbers on about every other shotgun loading. They would likely sell like hot cakes in 3 and 3 1/2 inch if located in the pistolgrip, breacher choke, mag extender and heat shield aisle of the local LEO (cuz mall ninjers like LEO stores since they are practically a copper and all) and mall ninjer store...
Brent