(One of the weapons of the tank I'm working on.)

S.S.R.C
[Smart Slug Repeater Cannon]
Maximum Capacity: 36 (32 in drum, 4 in loading mechanism)
Rate of Fire: 120 rounds per minute

The SSRC is a vehicle-mounted auto cannon designed to fire the Smart Slug round.
The drum under the barrel is the ammunition drum. The ammo drum holds 32 rounds, stacked in four columns of 8. The opening on the end of the drum is situated in such a way that only one column can be accessed at a time. The four columns are arranged on a rotating carousel that bushes the rounds out of the drum, and rotates as each column is expended.
The gun employs a second rotating carousel to bring rounds to the breach, and to eject shell casings.
The small radar dish on top of the gun utilizes an extremely focused field of vision in order to accurately track incoming tank rounds, artillery shells, and missiles. By feeding this data to the Smart Slug rounds, it can intercept these threats before they have a chance to kill. Due to the radar's focused vision it can only track, not search. It must be given targets to track from the vehicle it is mounted to.

[Smart Slug]
Dimensions: 3" dia. x 9" length
Operational Range: 145ft - 5200ft

The Smart Slug kinetic round and has no explosive warhead. It is designed to melt to, and fuse together whatever it impacts with. When fired at key points (i.e. treads or the seam between the turret and the hull), it can be used to disable and immobilize tanks. Through the use of a laser-tracking camera (3) and collapsible fins (8), this round can achieve the accuracy necessary to hit the mentioned soft points on enemy armor.
The bottom chamber (5) is filled with blasting powder, which is detonated by the percussion cap (6) upon firing. This gives the round it's initial speed.
The chamber containing the rocket motor (7) and fin (8) assembly is filled with alcohol. This prevents it from collapsing under the pressure created from the blasting powder. When fired, the heat from the launch vaporizes the alcohol, pushing this protective casing off and giving the round a small boost in speed.
Once in the air, the collapsible fins (8) deploy and the rocket motor (7) fires up. The rocket is not very powerful, but burns for a long time. This gives the shell a small boost in speed, but mainly just keeps it from decelerating. The camera (3) begins searching for a laser. Once the target is acquired, a small computer uses the fins to guide the shell.
Once the round is about to hit it's target, a high-temperature fuse (4) ignites the thermite-based compound filling the to of the shell (2). This destroys all of the internal tech, and brings the main body of the shell (1) to a temperature just below melting point. The energy of the impact finishes off the melting of the shell, and releases the already-molten remains of the thermite compound. The liquid blob slightly melts the metal around it, fusing it together like glue.