Here is an interesting pseudo study from the Violence Policy Center (VPC). On the surface it seems to be just a screed railing against the 50BMG rifles but buried near the end is this policy recommendation:
Military surplus armor-piercing (AP) and armor-piercing incendiary (API) ammunition for .50 sniper rifles is widely and readily available. Although Congress has banned the manufacture of some armor-piercing ammunition, those restrictions apply only to handgun ammunition. The existing ban on armor-piercing ammunition should be updated and expanded to cover all AP and API ammunition. This would most effectively be accomplished through the promulgation of a performance standard in which ammunition is tested for its ability to penetrate bullet-resistant vests, ballistic glass, and armor, as opposed to the existing standard based on the bullet's content. [Emphasis added]
Virtually any center fire rifle round will penetrate a Class IIIA or lesser bullet resistant vest. The Level III vest will stop rifle rounds up to a 308 but is too bulky for everyday use. To reliably stop center fire rifle rounds requires adding a "plate" which is usually only good once. In effect, the ban proposed by the VPC constitutes a ban on almost all rifles including those commonly used for hunting. That last part should alarm those hunters who stay aloof from the fight for gun rights. The Second Amendment is not about hunting but if the victim disarmers succeed in emasculating it, then your hunting rifle will be on the confiscation list too.