Do you want penetration or maximum expansion?
Your bullets are very interesting, but I believe I'll stick to the more conventional bullets that expand less and penetrate more. I prefer a bullet that will punch through someone's arm (if it's in the way) and still get to vital areas.
If I imagins someone pointing a gun at me with a two-handed grip there's a lot of stuff between me and his chest. Of course, if it's gotten that far it's probably too late anyway....