I have to ask...why do you want sooooo much penetration?
Each one of the rounds in my post above, will go clean through 1/8" plate steel AND KEEP GOING through 4 layers of a truck door...
What do you plan on stopping?...a tank?..a runaway dozer?
I honestly think penerator rounds out of a 500 is wayyyy overkill, and could possibly cause a lawsuit, due to serious overpenetration.