Holy cow, your costs are high!
My costs here in Idaho, bought at the local retail establishments:
Powder=$16-25 per pound
Primers=$2 per hundred
Bullets can vary widely, but $36 per 500 seems to be the going rate for .45acp Laser-Cast or Berry's.
Put that into my trusty spreadsheet, and I get a cost of $5.28 per 50.
The bullet is the biggest chunk of cost.
I am Pro-Rights (on gun issues).