To all that say it is the same to salvo 2 @ 500lbs versus salvo 1 @1,000lbs:
That is only 1/2 true. What you need to consider is a 1,000lb and 2,000lbs, you have a larger blast radius than a 500lbs. I can't tell you how many times i go up in lancs of 2,000lbs loadout and it is easier for me to destroy targets at alt than 500lbs. So don't really agree with that premise with respect to that argument.