Main target is cruise missles - been deployed for some time.

One of the first aircraft mounted with a Vulcan canon shot itself down. Fired a couple seconds burst, then accidentally flew through the descending swarm of rounds some miles later.

Biggest early problem with these guns on some aircraft was the combustion byproducts putting out the jet engines.

Vulcan canons are widely deployed in sizes from 7.65mm to 30mm.