SS 195 is this supposed to happen?

Just shot this from my PS90 tonight at water jugs and recovered the bullet. Other than a little bend no expansion at all. The aluminum core did poke out the back a little, but I pushed it back in. The SS 197 blew up one milk jug and passed into another. The SS 195 went through two heavy laundry soap jugs and bounced off the milk jug.