Back (sort of
) on topic* :
In addition to the prop/wing wash and all other sorts of environmental factors that would mess with one's aim, wouldn't being in a turn/maneuver that involves anything other than modest g-forces (under 2?) also play havoc with one's ability to put rounds on a target? Physical effects on the pilot notwithstanding: wouldn't the bullets go all over the place if you were throwing the aircraft around violently -even if you were really close? ie: At some point you've got to steady the aircraft in order to fire, yes?
*although admittedly tangental, I think it relates to the accuracy of the guns --and how it's (mis)represented in flightsim games.