[nn]

Hello. My own informal expansion tests with them as well as what I have seen from others indicates that they do not expand. None had any "base" left when removed from gelatin, water, ductseal, or "wetpack" and without it, pressure cannot build in the bullet itself to promote expansion.

Best.

Air pressure would blow the base wad off, either in flight or on hitting something; then you have to hit something hard to get bullet deformation, as you found in your tests.