I have a pig hunting opportunity in a lead-free ammo zone. I am hoping to use my (vintage) 1886 Winchester lever gun, but I don't know of any copper bullets I can load it with. I figure copper is going to be larger than lead so that will probably limit the weights and charges I can use (these 1886s will not tolerate anything over . Barnes has some 300 and 400 grain copper but their load data does not cover vintage guns. What is one to do?