This is my translation of the Fabricaciones Militares catalog around 1979, so I beg your pardon for my English.
7,62 x 33 mm INSTALASA for SUB-CALIBER Rocket 88.9mm.
Instruction Cartridge for a sub-caliber for a 88,9mm Rocket Launcher that produce a similar trayectory to the rocket up to 300 metros.
RED paint on the point and around the primer.
7,62x63 mm (.30-06’)