moot,
Not against tanks. I can (and have) hit M-16s and M8s from 1000yds to knock them out, and maybe turret an Ostwind or Wirblewind, but doing a tank from that range would require a LOT of luck.
splitatom
I don't have it on film but there was an attack against a Rook GV base a while back where I rolled out a B-25H to provide air support. Knights were hitting it with about eight Panzers, and there were a few friendly GVs in the area and one A-20. I took out one Panzer with bombs, and the A-20 got another one or two with his eggs. I then gunned down three more Panzers with four rounds TOTAL (all four rounds hit. Two were one-shot one-kill, one I didn't quite have the approach angle right on my first pass).
As it stands now it's all in where you hit them and from how far. Give the B-25H AP and guaranteed you'll be seeing tanks getting popped routinely from 1500-2000yds out. There wouldn't be a better pure tank-killer in the game.