Cast bullets! I make all my handgun bullets, they are usually free. Seems like the Hornet was just made for them.
155 45gr cast bullets from a pound of wheel weights. Add a gas check, damn near free and about 4grs Unique thats it. You can load 1750 rounds from a pound of powder. $18 per pound = .01 cents per round. Maybe a penny for a gas check and whatever primers go for and there you are. I'd figure the primer cost for you but haven't bought them in years. Still have about 25,000 on hand!