The MT-12 100 mm ammunition suite covers fixed rounds documented for the MT-12 and T-12 smoothbore anti-tank guns, from 3UBK-10 / 9M117 guided ammunition to sub-caliber, hollow-charge, and HE-fragmentation rounds. Public conflict evidence is narrow but direct: Ukrainian 93rd Mechanized Brigade footage in July 2022 showed Bulgarian-made 100 mm 3UBK2 HEAT-FRAG projectiles being loaded into an MT-12 Rapira.
Defense Express reported July 2022 footage of Ukrainian 93rd Mechanized Brigade soldiers loading Bulgarian-made 100 mm 3UBK2 HEAT-FRAG projectiles into an MT-12 Rapira, framing the rounds as imported ammunition for Ukrainian MT-12 guns.
Role detailsBelspetsvneshtechnika lists this 100 mm ammunition family for the MT-12 and T-12 anti-tank guns.
| Firing weapon | Weapon type | Firing evidence |
|---|---|---|
 | 100 mm smoothbore anti-tank gun | Belspetsvneshtechnika lists this ammunition family for the MT-12 and T-12 guns, including 3UBK-10 / 9M117 guided rounds, UBM1 and UBM2 sub-caliber rounds, UBK2 and UBK2M hollow-charge rounds, and UOF3 HE-fragmentation rounds; Defense Express later documented Ukrainian troops loading Bulgarian 3UBK2 rounds into an MT-12 Rapira. Sources: 100 mm anti-tank gun MT-12 Rapira, Defense Express Bulgaria MT-12 shells |
Belspetsvneshtechnika describes MT-12/T-12 ammunition as a mixed load: guided anti-tank ammunition, armor-piercing sub-caliber rounds, hollow-charge rounds, and HE-fragmentation rounds. The visible public trail is strongest for the family designations and for a July 2022 Ukrainian loading example involving Bulgarian 3UBK2 rounds.
| Family | Round and projectile | Documented role |
|---|---|---|
| Guided anti-tank | 3UBK-10 fixed round with 9M117 missile | Laser beam-riding round for tanks, self-propelled guns, fortifications, and engineering structures. |
| AP sub-caliber | UBM1 / ZBM1 and UBM2 / ZBM2 | High-velocity armor-piercing shots for tanks, self-propelled guns, other armored targets, and fortifications. |
| Hollow-charge | 3UBK2 / UBK2 with 3BK3, and 3UBK2M / UBK2M with 3BK3M | Direct-fire HEAT-fragmentation rounds for armored targets, light shelters, and manpower; Defense Express documented Bulgarian 3UBK2 rounds loaded by Ukrainian troops in 2022. |
| HE-fragmentation | 3UOF3 / UOF3 with 3OF15 projectile and V-429E fuze | Fragmentation fire against manpower, firing points, field-type engineering structures, and other targets. |
| Basic load | 20 rounds | Belspetsvneshtechnika lists 10 AP sub-caliber, 6 hollow-charge, and 4 HE-fragmentation rounds. |
