It did come to a rest facing rearwards. We shouldn't really draw any conclusions from one test shot. It could be the velocity was too low or even a rare statistical anomaly. In any case, I'll definitely repeat a lot of these tests.
It is important to remember, though, that water typically shows the absolute most possible expansion/upset/fragmentation possible with a particular bullet. I've seen bullets penetrate LESS through water than through gelatin.
Just here for the 10mm death ray talk.