I have a 20x139 HS820 cartridge that I believe was manufactured by Rheinmetall GmbH, and I’m a bit confused by the projectile color code. It has a blue projectile with an approximately 5mm-wide black band just above the driving band. What does the black band signify?
The projectile markings are in white:
RH- 01 -X
The headstamp is:
20x139 DM 141 LOS RH-2- 28 -X
I can post a photo later if that would help.