A mix known as Lyman #2 should prove to be great for hunting with that gun.Lyman#2 is 90%lead,5% tin and5% antimony,has a hardness# ~15.
A mix of 9 pounds wheel weights and 1 pound of 50/50 bar solder= 10 lbs of #2.
also, 4lbs of linotype,1lb 50/50solder and 5 lbs pure lead=10 lbs #2.
for plinking any thing that melts will work.Serious target work maybe done with either straight ww's or the much harder linotype. Remember, the lino bullets SHOULD cast larger than the wheel weight ones.Slug your bore and get a sizer to match or .001/.002 over bore dia.
Did you get a 200 gr. mold? You can push a 200 grain bullet over 2200 fps! Soft bullets will probably lead the bore no matter what lube you use.
Gas checks are definetly called for here.
hope this helps ,jh