But how many rounds are usually expended per missile intercept? How many rounds does an aircraft carry? Can CIWS intercept a Mach 3 missile while on an aircra

But how many rounds are usually expended per missile intercept? How many rounds does an aircraft carry? Can CIWS intercept a Mach 3 missile while on an aircraft flying above Mach 1 (a relative speed of Mach 4+)? Is it a good tactic to point your aircraft nose at an incoming missile? Why hasn't this been done already?