“Where to go with this”
I wonder how closely BATF monitors the private, online selling of ammo? I wouldn’t suppose the cartels or the American gangs are much interested in .22. Perhaps the criminals just got unlucky. If it wasn’t an inside job, they probably assumed they were getting a mix of calibers.
Could be 22 mini mag HP...Not something I’d want to be hit with. Even a standard 22 round is quite lethal.
I’d bet a cup of coffee someone in the company or maybe the truck drivers are connected to one gangs/cartels. Maybe that’s why the drivers were released alive.