Wolf,
I don't quite undersatnd the question.

Are you looking for equipment to make arrows that heavy or do you already have 550 gr arrows that you are using?

I would go with the heaviest aluminum arrows you can find,and 150 gr broadheads ,fleacth them with quick spins cause that adds more weight than standard fleches and that should get you close.

You should be doing great with the 550's though you should have enough penetration to go through heavy bone,plenty of KE's for elk.
BBJ