The GAU-8 is a laser beam while the M-61 is a shotgun.

There was minimal dispersion with the M-61 on a stable platform like the A-7 or F-105. Even the SUU-23 pod would fire a fairly concentrated burst if mounted properly....and it helped if it was pointed in the right direction.

The GAU-22 has half the ROF of the M-61, so even with minimal dispersion, you get half the rounds out toward the target over the same firing period, albeit bigger, harder hitting rounds. Not so much a factor A/G as it is A/A.

That 34 seconds is impressive, but how soon we forget 40 second Boyd. That was 60 years ago and he started with his opponent 1000 feet behind him.

So we've dropped 6 seconds in 60 years as a measure of aerial gun employment progress.