Neatsfoot oil works for a hunting patch lube as well.
It is available at any place selling horse feed and tack. NOTE, you don't want "compound" (NFO adulterated to be cheaper), you want PURE NFO-it'll be on the same shelf and cost a bit more.
Lots of other uses for it too.
Also, your point of impact should change a little between water/spit type lubes and oily/greasy lubes. Learn the difference...more shooting!