OVERVIEW: The 100mm Armor-Piercing (AP) tank ammunition is designed for engaging and destroying armored vehicles through kinetic energy penetration. It has seen widespread use in Soviet and post-Soviet tanks and anti-tank guns, particularly during the Cold War era.

DETAILS: This type of ammunition typically includes solid-shot AP, AP-T (tracer), and APC (Armor-Piercing Capped) variants. Fired from rifled 100mm tank guns such as the D-10T series used on T-54/55 tanks, these rounds rely on high-velocity impact to penetrate enemy armor. AP projectiles are often made of hardened steel and may include ballistic caps or windshields to improve aerodynamics and post-armor effects.

SPECIFICATIONS:
Caliber: 100mm
Type: AP / AP-T / APC
Penetration: Approx. 150–180 mm RHA at 1,000 m (varies by variant)
Fuze: None (solid shot)
Velocity: ~880–900 m/s
Effective Range: ~1,500–2,000 m
Platform Compatibility: T-54/55, SU-100, and similar systems

NOTES:
Effectiveness decreases against modern composite or reactive armor.
Largely replaced by APFSDS in modern tank warfare, but still in use in some regions.

SOURCE:
Soviet artillery and armor manuals
https://en.wikipedia.org/wiki/D-10_tank_gun
https://www.tankarchives.ca/