The round below was given by a police officer to a friend who was a collector. I was sitting at the table watching the exchange. The officer got it from another law enforcement individual but he didn’t say who. With the cartridge was the end torn off the Federal box which had an “X” number on it. The story is that it was a test load that the unnamed individual’s agency was trying out. I recently obtained the cartridge, but the the end label had disappeared. The cartridge first showed up about 2010, here in Atlanta GA.
Can anyone identify this cartridge and perhaps add some background???