The following is a list of ammunition fired by the 125 mm smoothbore gun series used in the T-64, T-72, T-80, M-84, T-90, PT-91, T-14 Armata, and other tanks derived from those designs, as well as the 2A45 Sprut Anti-Tank gun.
125 mm APFSDS-T (TAPNA) is divided sub-caliber armor piercing round designed for a 125 mm smoothbore gun integrated in T-72 and T-8O UD MBT series. The round consists of a sub-caliber projectile...
The majority of modern tanks are fitted with smoothbore guns, which do not utilise rifled barrels in order to impart spin to projectiles as they are fired (see Annex B). characterisationexplosiveweapons.org
In the 1960s smoothbore tank guns were developed by the Soviet Union and later by the experimental US–FRG MBT-70 project. Based on their experience with the gun/missile system of the BMP-1, the Soviets produced the T-64B main battle tank, with an auto-loaded 2A46 125 mm smoothbore high-velocity tank gun, capable of firing APFSDS ammunition as ... en.wikipedia.org