I can see having to hit the tank with 250lb'rs, but with a 1000lb I would think something in the crater radius should be enough to disable it at the very least if not totally disable it.
Twice this week I've gone hunting tanks with bombs, 1000lb'rs both times, yet not killed even one. I didn't hit it directly on the roof, but both times I hit with the tank, stationary, in the blast radius of the crater. It just sat there in the crater... one time I made another pass with my second bomb, the craters overlapped with the tank in the middle... then the tank drove away.
I want to be able to hunt tanks with bombs and not 20mm hispano. Maybe someone with real experience of the damage of a 1000lb bomb feels.
Soda