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OG-15BG1 not OG-15G1
73 MM ROUND OG-15BG1 WITH HE-FRAGMENTATION GRENADE OG-9G1
73mm OG-15BG1 is designed for destroying troops in the open, in trenches, in hasty field shelters or brick-wall fortifications, as well as for destroying light armored vehicles. The warhead contains powerful explosive and prefabricated fragments increasing its fragmentation effect. The grenade is equipped with O-4M impact fuse. The design enables the usage of delay and proximity fuses.
Maximum Aimed Range (m): 1,300, 600 or less on the move
Max Effective Range (m):
Day: 1,300, but 600 or less on the move
Night: 800-1,000
Tactical AA Range: -----
Armor penetration (mm): ----, can damage/defeat APC.
The Russian language photo you loaded adds the following details:
max range (theorical) 4000m
initial speed 230 m/s
Yes, most certainly Bulgarian and not Russian. The original designation in the brochure's text may be incorrect (a typo), or something different (see later text).
A round of ammo, in standard nomenclature, would be OG-15VG1 (ОГ-15ВГ1) and not OG-15BG1 (ОГ-15БГ1) as per the brochure. In standard nomenclature the 'V' (В) is short for the word for a round of ammunition; as per the text 'Vystrel' (Выстрел). It could be the case that the 'B' (Б) is short for Bulgaria (България), but I'm sceptical.
The projectile component for this round of ammunition is the OG-15G1 (ОГ-15Г1). The propelling charge assembly's base designation would be PG-15P (ПГ-15П), but this can change. It can change if components within it are different, either due to being modified for various reasons, or to accommodate a different projectile.
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