YOU claimed the Pristine Bullet was traveling "BACKWARD". And now you are trying to run away from that. I'm holding you to what YOU said.
To be fair, I think what was being suggested that the bullet was tumbling (rotating about its transverse axis) and, therefore, travelling backward for just an instant in time every rotation. If a pristine bullet is tumbling, it would have to have become unstable while passing through air. The MC FMJ bullets did not do that in passing through a few hundred feet of air. I don't see anyone suggesting that a pristine bullet was tumbling. You said it was being suggested but I don't see where anyone else argued that.