If you're planning a shotgun-themed wedding, then Etsy seller MysticLair's edible shotgun shell cake-toppers might just be the thing for you. Also potentially useful for adapting in a shotgun-themed rendition of the oft-fatal "bullet-catch" conjurer's trick.
Shotgun Shells Edible Grooms Cake Topper Fondant gumpaste TWO
(via Neatorama)