I was doing 1,000 yrd 50mm gun tests against targets, with the B-25 sight, and if you tap page up just a bit you can find a sweet spot where the big gun is not only remarkably accurate at this stand off range. But also the rockets are right on when sighting using the lower/double horizontal sights at 1,000 yrds. Or meters, or whatever it is.
I havnt tried it against bombers yet but it may very well be the ultimate standoff weapon against bomber formations. On the other hand Ive hit plenty of airplanes in bomber guns at the same range and with the window cockpit, is the glass hardened?, your going to catch some lead. But if you jink in and out of 1,000 yrd range this plane should be invulnerable as a bomber killer. With its long range perhaps a perfect CV defender.