Ammo for the 120MM Smooth Bore of the Abrams
The L44 can fire a variety of shells, and while the majority are primarily designed for the anti-tank role, most of them can also successfully engage other types of targets as well. The L44 is presently rated to fire the following types of ammunition:
Armour-Piercing Fin-Stabilized Discarding Sabot (APFSDS): A round that uses a dart made of depleted uranium (used by the U.S. Army and others, but not by the German Bundeswehr) or tungsten to pierce the armor of enemy tanks using kinetic energy. The U.S. version, the M829A1 gained fame during Operation Desert Storm for its lethality against Iraqi tanks, leading some tank crews to give it the nickname "silver bullet".
High-Explosive Anti-Tank (HEAT): A shell with a shaped charge warhead.
Multi-Purpose Anti-Tank (MPAT): A HEAT round with an added proximity fuze to allow it to engage slow, low-flying aircraft such as helicopters.
Canister: A shell filled with tungsten shot that acts like a giant shotgun shell for use against buildings, dug-in infantry fighting positions, and thin-skinned vehicles.
High-Explosive Fin-Stabilized (HE-FS): A shell with a proximity fuze for use against low-flying aircraft, and against tanks by air bursts against rear and top armor.
Source of the info here,
Rheinmetall 120 mm gun - Wikipedia, the free encyclopedia