Glock35, what is a "standard" bullet proof vest. First of all, none are bullet proof. You might as well drop that expression all together. They are resistent to ballistic penetration at various levels. "Bullet proof" is a misnomer.
A lot of calibers may be "banned" or made illegal at some point, but I doubt the real reasoning will have anything to do with penetrating ballistic vests. That sounds like pure folklore or paranoia reasoning. Note the lack of deail. What sort of ballistic vests are we talking about? Level II, IIa, III, IIIa, or IV? Several handgun calibers will go through the IIa vest, some through the II level, but those calibers are not banned.