You can fit even large ammo of 2-4k m3 of what you might use for a month in any industrial except those PI/mineral/ore gallente. The minmatar I mentioned is 40k special bay for ammo, excessive to carry that amount except to market for T1 (or XL ammo I guess) and dumb as hell to carry that much faction/T2 ammo when the tank on T1 industrials suck, T2 at least you have better odds. Just makes the industrial look less appealing.