Though the gatlin/mini-gun has been around for a long time, it's still a devastating weapon no matter what rounds are put in to it....
we'll never tire of coming up with newer ways to kill each other.
Easy Vietnam. Was used by F4s after they found a missle only F4 was not so good an idea over Hanoi. Seems that push-button warfare wasn't all that wonderful. Migs just got close and use their guns.
You will have to see the series called Dogfights. Man it's one good series and Robins Olds, a P-38 and P51 driver in WW2, found the gunless F-4 a real handicap (but he got 4 migs anyway.)