To be hit from B-17 a mile away is rather rare event. But to be hit from B-36 a mile away should be rather common.
By the way my impression is that the most "angry bomber" in the game is Pe-8. His gunners rarely "sleep", while for example B-17G often "sleep" despite having a lot of ammo and often don't shoot even at very close distance when probability of hit is close to 100%. (I admit that fighter's pilot can have other opinion, but my opinion is based on a lot of watching AI-against-AI). This is how currently gameplay logic ("brains") works.