The 53-OF-843B (53-ОФ-843Б) is a 120 mm calibre fragmentation mortar shell. Among other things, it was used in Czechoslovak mortars PRÁM-L and PRÁM-S.
Source: https://www.valka.cz/clanek_1129.html
Citace :
Mine cartridge 53-OF-843B
Weight:
- Mine with fuse: 16 kg
- M-12 fuses: 0.535 kg
- Explosives: 1.750 kg
Length of mine with fuse: 5.558 calibers
Number:
- 6 additional charges.
- Remote charges: 1
Weight:
- Refills: 77 g
- Remote refills: 720 g
V0 with remote fill: 335 m/s
Source: https://www.valka.cz/clanek_1129.html