The extra cases are there because certain states require them to be on file with the state police. New Jersey being one of them. It is just one of the onerous restrictions on our gun rights.
The cases have nothing to do with "proof loads" or test firing. These cases are shot just before gun is recorded as complete and are for the LEO of your jurisdiction if required.
Thanks, THA
Are you saying that the bullets fired from those two cases are sent to some law enforcement agency to have the lands and grooves recorded for future tracing purposes? If that's the case, I'll just have to buy a replacement match barrel for this handgun. God, do I hate when gun owners are treated like criminals! Jim