While I could see the point for these things in an Elephant, Rhino, or Cape Buffalo hunt, I can see absolutely no reason at all going after a Whitetail Deer that weighs not much more than the damn cartridge for these cannons. I mean seriously hubel, who in their right mind would carry one of these things into the field for whitetail? You keep saying "shotgun only" states but I would have to doubt very seriously the legality of one of these things in IL if one got caught. Not to mention, who in the hell would want to lug a 20-30 pound firearm hunting? I would tend to think if Johnny Law snatched you up and they said "this aint legal boy" they aren't going to listen to someone saying "But your Honor, Huble458 on the internet thing said it was"!