The SUU23 pod gun on the F4 centerline would pull the nose down - the
pipper would start to move down on the target about half a second
after firing began, but it was easily compensated with a little aft
pressure in the stick. I once fired a 3-second burst (doing a little
pre-combat research) beginning at 4500 feet from the ground target
(acoustic scorer) and scored 100 hits. FWIW the pod gun's dispersion
was such that it would make a good 'shotgun' for the
knife fight'. The SUU23's shot pattern was about 8 mils in elevation
and about 10 in azimuth; still a pretty concentrated pattern at 100
yards - the length of an American football field, and a familiar
distance to most US fighter pilots.
The 366th Wing at Danang had an F4E (call sign Chico) with two
wing-mounted SUU23s plus the nose gun. It was hogged by the 0-6s who
took it out on troops-in-contact calls. Would have made a heck of a
dog fighter because you could take any kind of shot with a good chance
of a kill - including those hairy head-on passes.
Walt BJ