The sole 'logic', if you wish to call it that, can be a shotgun does not have a rifled barrel. Makes it simple for that Goobermint; no rifling, it can't be a rifle. Nonetheless there are actually rifled shotgun barrels or slugs that should handle the spin and they are https://ebusinesspages.com/Hand-Crafted-Metalworks_eouzo.co?PostReturn=0