Right now, yes. Later on, no.
Because there has to be a seperate bill to ban them.
No. That is exactly wrong. The law is being made now to ban "armor piercing" ammo. The study creates new parameters to define ammo as "armor piercing." No new law is then necessary to ban additional types of ammunition. A bureaucrat simply adds new types of ammunition to the list of banned "armor piercing" ammo as defined by Congressional study and that's it.
Who will even say how heavy the body-armor used in the study has to be? No one will vote on a law about that.