TIP: Don't take the 1000 lb bombs. What happens? YOu salvo 1 and you use 3000lbs (total), but it's not enough, so you salvo 2, and you waste 6000 (total) on what would only need, say, 3500lbs.
Take 500lb bombs, salvo 3, that's 4500lbs (total) per hangar and you have more drops than if you used up surplus 1k bombs.
Or take 250lb bombs and salvo 5 (works best on slower bombers, if you're FFT at 250mph you'll miss the hangar with most of them).
One note on 1k bombs: Don't drop the salvo the second the hangar touches the crosshair, drop when the crosshair is dead center (or just past) the hangar, that way your drone bombs have the best chance of landing on the target and not next to it.
I've not used 1ks for hangars in a little while so I can't tell if it's changed. I have used the 6x 2000lb load in lancasters to good effect (salvo 1 and you can take out 6 hangars, even a VH, in one blow each).