I've heard it described as "a gun in search of an airplane."
Here's What You Need To Remember: As a result an alternative was found — depleted uranium, a by-product of the enrichment of uranium for nuclear power reactors. It boasts approximately 60 percent of the radioactivity of naturally-occurring uranium. As an added benefit, fragments burst into flames when they break off from the main projectile. General Electric’s promotional material is careful to generically describe the depleted uranium as a “heavy metal.”
General Electric’s 30-millimeter GAU-8 Avenger cannon has been the primary weapon of the U.S. Air Force’s A-10 Thunderbolt II ground-attack plane for more than 40 years. It also arms the Goalkeeper naval close-in weapon system.
It’s a huge and awesome gun.
The GAU-8 has seven independent barrels with rotary-locking bolts that are mechanically actuated. The weapon is powered by a pair of hydraulic motors and can, in theory, spew up to 4,200 tank-smashing, depleted-uranium rounds per minute.
https://nationalinterest.org/blog/reboot/uranium-bullets-10-warthogs-cannon-truly-fearsome-weapon-164803