Hollow point/expanding ammunition?
Hollow point and "dum dum"
Legal to buy. Legal to use.
Legal only in exempt areas. These include your home, a range, a gun shop/smith or to hunt.
Transportation of hollow points can only occur between a gun shop, a range/hunt and your home. There is a funny quirk in the law that prevents you from transporting hollow points from one home(i.e. exempt location) and another home(another exempt location) or property owned by you. In those circumstances you must first travel to a range, then you can proceed to the other home.
All other instances are strictly illegal. Just getting caught with a single .22 rimfire you accidentally left in your vehicle is a serious crime.