"Hollow point" was original for rapid expansion. Match bullets mad eon jackets with a closed rear will also have a open tip / hollow point, but because of the thicker jacket will not act like the bullets from the original definition. There is a lot of confusion on this matter, also in ouw laws that civilian may not have expanding ammunition, but the match HPBTs are not the same thing. Hence the change to the OTM designation, although I don;t see why they did not call it OTBT, as the boat tail is no longer designater.