page_title: 2A28 Grom
section_title: Ammunition
hierarchical_section_title: 2A28 Grom / Ammunition
caption_attribution_description: English: Drawing of a Russian 73 mm PG-9 HEAT projectile used in 2A28 guns
context_page_description: The 2A28 Grom is the main armament of the BMP-1 and BMD-1 infantry fighting vehicles. It is a 73 mm low pressure smoothbore semi-automatic gun with a wedge breech block. Development of the 2A28 Grom was directly linked to that of the SPG-9 recoilless gun; both fired projectiles similar to rocket-propelled grenades.
context_section_description: The 2A28 'Grom' smoothbore gun fires the same projectiles as the SPG-9 infantry light recoilless gun, but with a smaller propellant charge. Before 1974, the ammunition only consisted of high explosive anti-tank (HEAT) rounds; the PG-15V HEAT fixed fin-stabilized rocket-assisted round. After 1974, OG-15V HE-Fragmentation projectiles were introduced. In the Ob'yekt 765Sp3, the standard ammunition load is 24 PG-15V HEAT rounds and 16 OG-15V HE-Frag rounds.
  The PG-15V HEAT round weighs 3.47 kilograms (7 lb 10 oz) and uses a 2.6 kg (5 lb 12 oz) PG-9 shell with a 0.322 kg (11.4 oz) RDX explosive charge in the warhead. A small PG-15P powder charge is used to boost the projectile from the gun barrel at 400 metres per second (1,300 ft/s). Once the projectile has travelled 10–20 m (33–66 ft), the rocket motor starts and accelerates it to 700 m/s (2,300 ft/s).
  The OG-15V HE-Frag round weighs 4.57 kilograms (10 lb 1 oz), it uses an OG-9 shell with a 0.73 kg (1 lb 10 oz) TNT bursting charge. The muzzle velocity of the OG-9 is 290 m/s (950 ft/s). The OG-15V is loaded by hand as it is too short to be handled by the autoloader.
  2A28 Grom turret has a launcher for Malyutka and Malyutka-M ATGMs.
caption: Drawing of PG-9 HEAT projectile
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