This is not an area of the case I've given that much thought to in the past but my understanding of the evidence as it stands leads me to really suspect that CE399 was introduced into the evidence chain at some point.
As I don't believe Oswald actually took the shots that day I am, by default, a Conspiracy Theorist. For Lone Nutters it's plain sailing, your narrative has been provided for you, your thinking has been done for you and, although there may be small variations in specific details, the outcome is set in stone. As a Cter I am part of a spectrum of thinking that ranges from eminently sensible through to I'm-riding-a-unicorn-to-my-nearest-mothership.
I'm a minimalist, that is to say, things happened as per the official narrative except it wasn't Oswald who took the shots. Even this leads to massive, unprovable assumptions.
But now I find myself being dragged into a much larger conspiracy and I find I have to play Devil's Advocate against myself!
The arguments I've presented in the last few pages are leading me to suspect FBI agent Elmer Todd as the person who introduced CE399 into the chain of custody. This leads to a massive problem as far as a conspiracy is concerned:
If CE399 is introduced into the chain of custody at the FBI lab in Washington on the evening of the 22nd, how is this possible if the rifle this bullet was fired from didn't get to the same FBI lab until the morning of the 23rd?
It seems beyond unlikely that Todd had a slightly distorted bullet on his person that could be matched to the MC. As Andrew has already pointed out, it is the completely random discovery of a bullet at Parkland that has led to the possibility that CE399 could be introduced in the first place.
The idea that Todd had this slightly distorted bullet on him just in case someone found a random bullet at Parkland is a non-starter.
I've no doubt the Unicorn Crew will have an instant solution to this problem.
But I'm not in a position where I can say "Wow, that's such a difficult question to answer I might as well ignore what the evidence is actually saying."
Maybe Wright is wrong or lying when he says the bullet had a pointed tip.
Maybe Thompson misunderstood or lied about what Wright actually said.
Maybe Johnsen didn't know he was supposed to initial the bullet.
Maybe Rowley didn't know he was supposed to initial the bullet.
Maybe Tomlinson genuinely forgot what CE399 looked like.
Maybe Wright genuinely forgot what CE399 looked like.
Maybe Johnsen genuinely forgot what CE399 looked like.
Maybe Rowley genuinely forgot what CE399 looked like.
Maybe a bullet passing through two men, smashing bones on the way, doesn't leave a trace on the bullet.
Maybe a bullet can just fall out of a persons body.
Maybe Specter genuinely forgot to ask Tomlinson about the bullet.
Maybe, maybe, maybe...
On one hand, the evidence strongly suggests CE399 was introduced into the chain of custody, on the other, how could anyone have known that it needed to be introduced into the chain of custody.