There's a fellow on GunBroker who will supply formed brass or will form brass that you supply.
He does a great job, is fast, and will anneal your brass as well (for an additional fee). I've purchased from him for years.
I've supplied new Winchester .30-30 brass and had it back in a week.
His handle (from memory) is 10mile. You can always do a search on zipper brass, you'll find him.
Last edited by dtalbot; 11/14/22.