Hate to be a fly in the ointment, but I'll bet that if I spend 10% of the cost of a good airgun on classic wooden mouse traps and rat traps, I'll eat pretty well and you'll be pretty lean. That doesn't mean high-velocity airguns and .22s are out of place -- love 'em both. But I think most of the easy calories in most environments move around at night, and unless you stay up all night with a starlight scope, they will zip right through your camp without so much as a wave. (That's my take anyway.)