No, I am not wrong.
Even though bomber guns' best convergent area is a range of d500 from the gunner's position, the guns themselves, due to the bombers' unhistoric level speeds, extend well past 1.5k behind the bomber formation, and can (and do) kill/disable at this range.
Historic ranges were about 300 yards for bomber gunners... Outside of that they had no chance of hitting and didn't fire.
Consider that cannon-armed LW planes were able to attack the bomber formations from "outside" the defensive gun range. This game has it all bass ackwards.