Well, there are also all those other costs associated with hunting besides a primer, powder, and a bullet. Licenses cost money. Gear costs money. Gas costs money. Lots of ancillaries that cost money. Unless you can walk out your back door to hunt and you process your own carcasses hunting is probably not all that cost effective a means by which to pay for protein.
There are fixed costs and variable costs, as well as variable benefits, for each hunting trip. The monetary benefit-cost ratio depends on how much meat and how many variable costs are involved for each trip. It's a lot more economical to shoot a moose than a deer on a given trip.
