Scenario: Mr. X needs to be "offed". Y gives Z his ammo. Y flies to California. Mr. X is offed while he is there.
Old law: You can't be in two different places at the same time.
But obviously Y knows something, ‘cuz it’s his name on the paperwork. When Y says “I know nothing about it”, investigators won’t just throw up their hands and say “OK, unsolvable mystery, case closed for lack of evidence.”
I don’t understand why people think “oh, just swap it” and “lost ‘em in a tragic boating accident” and other popular 10-second lines of thought would outwit teams of professional big-budget forensic investigators.
Great. Give ‘em ideas.
“Giving” ammo to another individual will be illegal with heavy fines and jail time.
Not reporting “stolen” or “lost” ammo within X hours of discovery will be illegal with heavy fines and jail time.
Buying ammo in calibers for weapons you don’t own will be...
Get the idea?