I was in a 152 in the MA 2 days ago chasing some B17s that were RTB after drop. I set one on fire, but I'm SURE it was only with the 20mms. I lit that SOB up like CHRISTMAS and got a measely amount of damage! I'm SURE I got a few 30mm in there too!
Anyways, I come in on the last plane (there were only 2) and make a pass, and another, and on my final pass I see I've got 33x 30mm left so I just saddle up and UNLOAD all but 6 rounds (firing all my 20mm at the same time!) and see millions of hits, not the LEAST of which was between 5 and 10x 30mm fireball hitsprites on the tail gunner/rudder/elevator position.
The plane didn't take any damage. I had given it a gas leak from a previous attack. That's it.
Hell I didn't even disable the turret! It shot out one of my 20mms and I bugged out, low on ammo.
He landed, I never got an assist or a kill.
SOMETHING is wrong with damage from 30mm right now. What, I don't know. I just know it's not working.