See CRAM: https://en.wikipedia.org/wiki/Counter_rocket,_artillery,_and_mortar https://en.wikipedia.org/wiki/Counter_rocket,_artillery,_and... C-RAM uses the 20

See CRAM: https://en.wikipedia.org/wiki/Counter_rocket,_artillery,_and_mortar https://en.wikipedia.org/wiki/Counter_rocket,_artillery,_and... C-RAM uses the 20mm HEIT-SD (high-explosive incendiary tracer, self-destruct) ammunition, originally developed for the M163 Vulcan air defense system. These rounds explode on impact with the target, or on tracer burnout, thereby greatly reducing the risk of collateral damage from rounds that fail to hit their target.