It would seem in that "bombable targets" area that there are some bldgs that aren't of value.
Not correct. All buildings in that area are functional and destroyable.
I say that based off of using different ordinances, 1000lb'ers always seem to reward the most amount of city hits although per AH website it says only 250lbs/bldg is needed.
That's a tad outdated, it's still for the old City, which had small buildings like the town did.
All factory buildings are rated 313lbs (= 1 250lbs bombs), while the City tiles take 844lbs to be destroyed. For example it takes a hit by a single drop of 250lbs bombs from a 3-plane formation to kill one City block.
You can always check the exact hardness number sin arena setup, even during flight.
When I drop with 250's I've not destroyed many city factories...
That's because the individual
factory buildings are much more spread apart than the ones in towns (which have the same object hardness). You need bombs with bigger blast radius, preferably 1000lbs and above.
If you are attacking the
City (center island), you have to keep in mind that the individual blocks are very large, and huge bombs are thus very inefficient, as there blast radius is too small. 250lbs bombs are the best 'fit here', even 100lbs bombs do work very well and are extremely efficient compared to the bomb weight. They do, however suck vs the factories as explained above.
The ideal loadout to attack the strats depends on what plane you are flying and what options it allows you to choose from.
In case of the B-29 (formation assumed)
80x100lbs (8k) - Very light and efficient loadout for attacking the city, allows you to climb faster to altitude. With perfect drop you can get 40 City blocks (=~47%), but 30 is more realistic in practice. Salvo 2 per city tile.
56x250lbs (14k) - Perfect City buster. Can get you up to 56 block (=~66%) if you don't waste any on the flak towers
12x1000lbs (12k) - Multi purpose loadout for attacking both City as well as factory targets, especially when all of them are at 100%. Fly down a City road right between the tiles and drop 5 1k bombs, at every 2nd road crossing. If done exactly, you will get between 10 to (practically) 14 destroyed blocks (=12-18%), increasing the town downtimes by 14-21 minutes. Then you still have 7 bombs left for the three key factories: AA, ammo, radar, which you can get down by about 20%
8x2k & 4x4K (16k) - Heavy anti-factory loadout. Total waste of effort when used vs City. 4k loadout gives you max effect vs 2 previously untouched factories (HC bombs with large damage radius), while the 2k loadout gives you greater flexibility against a higher number of factory targets, particularly when already damaged by other players
The old version maps were much more detailed.
But not necessary, as indeed everything in the bombable areas... is bombable