It is interesting that he first objected 14 years after the assassination. Did he have a photographic memory? The bullet had been entered as CE573 before the WC:

How could it have come about that this bullet, which is consistent with all the lands and groves on bullets fired by Oswald's rifle, gotten mixed up with the Walker bullet?
Probably not back in 1963.
That is called planting. Switch=plant=falsifying evidence etc.
It is only necessary to eliminate reasonable possibilities. They did not consider, for example, that aliens did it.
So that bullet disappeared and did not end up in the car?
You should read Bugliosi's book. It is circumstantial, but it is very compelling. Leaving the TSBD without permission, hurrying home to pick up his revolver - the same one used to kill Tippit, punching the arresting officer in the face as he uttered "well, it's all over now" as he reached for his gun ...... Not difficult to draw an inference of there, even without the Walker shooting evidence.
It is interesting that he first objected 14 years after the assassination. Did he have a photographic memory? The bullet had been entered as CE573 before the WC:Walker wasn't aware of the problem until he saw the picture of the bullet during the HSCA hearings. Not really surprising because until the HSCA investigation all the evidence was locked away at the National Archives. He then instantly objected and was completely ignored by the HSCA. He may well have had a photographic memory. I don't know. What I do know is that all the DPD reports on the Walker shooting, written prior to the assassination, mention a different type of bullet. Are we really to believe that all the people who wrote those reports got the type of bullet wrong in exactly the same way?
How could it have come about that this bullet, which is consistent with all the lands and groves on bullets fired by Oswald's rifle, gotten mixed up with the Walker bullet?Duh, if the scenario I proposed is correct, it was most likely switched on purpose so it could be used to argue that Oswald had a violent history.
Probably not back in 1963.We are not in 1963! Doesn't it strike you as odd today?
It is only necessary to eliminate reasonable possibilities. They did not consider, for example, that aliens did it.So, manipulation of evidence by law enforcement isn't a reasonable possibility to consider? Is that what you are saying?
So that bullet disappeared and did not end up in the car?Are you purposely pretending not to understand what I have said? And if so, why?
If you are still talking about the bullet we now know as CE399 than the answer is, no it did disappear nor did it end up in the car. It's evidentiary life did not begin until it was delivered to the FBI lab in Washington. In my scenario CE399 was never in Dallas, wasn't found on a stretcher at Parkland and was not fired on 11/22/63
You should read Bugliosi's book. It is circumstantial, but it is very compelling. Leaving the TSBD without permission, hurrying home to pick up his revolver - the same one used to kill Tippit, punching the arresting officer in the face as he uttered "well, it's all over now" as he reached for his gun ...... Not difficult to draw an inference of there, even without the Walker shooting evidence.And open goes another Pandora's box....
Leaving the TSBD without permissionIf that's what really happened, then I agree it's problematic. However, it's most certainly not conclusive as there are at least two possible reasons why Oswald left the TSBD so quickly. The first one is that he did the shooting and wanted to get out of there as quickly as he could. The second one is that, when he heard the shots and learned that Kennedy was hit, he understood that he had been set up for the murder and he simply panicked. The latter would of course also require him to be involved in what was going on, as it's highly unlikely that it would have been possible to set him up as a patsy without him being involved in some scheme or another.
Having said this, his behavior after he left the TSBD is also strange. Why would he get on a bus that would take him directly back to the crime scene? Why not take a bus in the other direction? And why would he offer his cab to a woman if he was truly in a rush to get out of there? It doesn't make any sense.
hurrying home to pick up his revolver He apparently admitted to Fritz that he did pick up his revolver, which he said he had bought in Fort Worth some months earlier.
- the same one used to kill Tippit,That's an assumption for which there is no evidence. Even worse, there is no chain of custody for the revolver they claimed belonged to Oswald. Hill carried it around with him for several hours before he had some officers in the DPD lunchroom put their mark on it, despite the fact that some were not even at the Texas Theater when Oswald was arrested.
punching the arresting officer in the face as he uttered "well, it's all over now" as he reached for his gunToo bad that not one single witness inside the Texas Theater heard Oswald say those words or saw him reaching for his gun.
This is precisely the kind of thing why Bugliosi has very little credibility. In a strong case, even a strong circumstantial one, you don't need this kind of "evidence". The mere fact that he did use this kind of BS material in his prosecutorial brief (which is basically what his book is) exposes the weakness of his case.