Hello,
Thank you for your answers. Finally I found this information.
Pyrocartridge PV-1M
ASSIGNMENT
Pyrocartridge PV-1M is assigned for activation of system for roof ejection from cabin of two-seat aircraft, by ejection of pilot seat KM-1.
TECHNICAL PREFERENCES
Length, mostly
25.5 mm
Caliber 7.62 mm
Mass 6.40 g
Mass of explosive substance 0.81 g
UN number 0276
Category number 1.4C
PACKING
Basically packing implicates 4 pyrocartridges in hermetic plastic box, dimensions Ø 61 x 50 mm.