Lots of good, thoughtful comments today!
In no particular order:
McCook nailed it. Ain't about how we think it should be, it's about how it is.
Someone else loading the ammo for you? It'll probably be a friend of yours, which will come out in court, and the other side will have an opening to make him look like an "unindicted co-conspirator." Not helpful to the defense...and not a good position to put your reloading buddy in.
Cosmo, I know you're a lawyer, but I don't know if you do this kind of case or not. While an individual's records are likely to come in during a criminal case such as embezzlement, financial fraud, etc., it is because in that sort of case, records kept by the individual parties are standard fare and it is the "common custom and practice." That's not so with handloads and shooting cases. It is VERY uncommon for reloads to be used in shootings; that's why there isn't much experience with the issue here on this forum...and why there isn't much experience with it in any given court, either.
What we're dealing with in the ammo is hard, forensic evidence, not paper trail evidence. Different side of the game, and the court will naturally default to what the "common custom and practice" is as to admissibility of "hard evidence," i.e., scientific evidence.
If someone we loved was raped, and the rapist had left a DNA sample behind, and we had a good suspect, the district attorney would demand a DNA sample from that individual. If the suspect and his lawyer said, "Sure, man, we'll drop off a blood sample at your office tomorrow," you and I would all raise hell, as would the prosecutor. The court would never allow it. The prosecutor would say, "Your Honor, this man has every reason to falsify the evidence. We can't know for sure this is really a sample of HIS blood and DNA!"
The court would doubtless agree, and the blood/DNA sample would probably never be allowed in court.
The same dynamic is at work in the handload-related shooting case. "Your Honor, this man has every reason to falsify the evidence. We can't know for sure that the exemplar cartridges he has provided, or the reloading data and records he has offered, are really a sample of THE DEATH ROUND!"
Once again, for the same reasons, the court would doubtless agree, and the ammo sample and reloading records would not be allowed. This was indeed what happened in the Bias case, where the defendant DID have meticulous records on his loads, and the Court refused to allow them.
Like Brother McCook, I don't like it any better than you. All of us here are looking at it from our own perspective, that of honest people who aren't lying. We HAVE to realize that once we are accused, even falsely accused, we become the SUSPECT and are treated accordingly.
Better to find that out now, here, in time to prepare for it, than to find out in court, later.
best,
Mas