tobnpr, I agree. Shooting a 30 caliber bullet into a 22 caliber bore might be catastrophic.
But I think trying to chamber a .308 Win. round into a .22-.308 wildcat chamber would end when the bolt wouldn't close on the case 'cause it's neck was too big to go into the chamber neck. But I get the idea you're referring to.
People have shot the necks off .30-06 cases as they were bonded to the bullet by electrolosis or something else for some reason. Case necks went into and out the barrel when the round fired. But the fired, neckless case ejected normally and the only comment the shooter made was to the effect that it sounded louder than normal.
US Navy Distinguished Marksman Badge 153
Former USA Palma Team Member
NRA High Power Long Range High Master
NRA Smallbore Prone Master