So, on planes like the B-26, where you can split the load into 8 500lb bombs, or 4 1000lb bombs, taking the 500lb bombs both increases your carrying capacity, and is more efficient when hitting hangers, and clustered targets?
And correct me if I'm wrong here, but it seems like the 500lb range of bombs is the most efficient in terms of weight vs lethality.
That is to say, even if you can carry 8 250lb bombs, taking 4 500lb bombs would be a better option, because the blast radius and kill radius are sufficiently greater, that more buildings will be destroyed /clumped-vehicles killed despite a smaller number of bombs, and a lesser theoretical kill limit.