The round in the pic is a 45acp "cyclone"goverment protype test round it is hollow all the way through and is a steel tube with a copper jacket it has a pusher disc at the bottom that falls away after the round is fired.This is the original design that PMC leased the rights from Abe Flatue the designer of the ring airfoil design.
These "cyclone" type rounds were used by the BATFE at waco and by other goverment types as their issue AP round and they are excellent AP rounds.
The 9mm cyclone rounds have a nylon cap to help stop the sharp steel edge of the bullet eating up the feed ramps in the MP5.
The "magic" of the tubular is not expansion of any type... but it is a excellent cutting round that dislodges tissue and cuts veins etc... as it goes through the target.
They are a very cool design that just seems to have been lost.
It may be because of the excellent AP ability of the ring airfoil design that the round has not been developed further for civilians.
Here is a pic of a 9mm prototype tubular "Pan Metal Corp" type all copper bullet,and some info on the "cyclones".