Turns well enough to dogfight in. And if they get behind you... you have 4 50's you can bring to bear on em. As for gunning tanks, the 75mm HE does a pretty good job. Works better on softer targets, great for taking down ords, town buildings, etc... and those pesky M3's and flackers.
And if you can line up behind a formation of buffs, you take take wings right off with it from 3K out easily.
Overshoots work like a dream as well. If you snap roll it repeatedly from about <250mph, assuming you don't drop your nose too much you can often force your attacker in front...and then zap them
AP rounds would make the B-25H so much less of a hangar queen!