RE: Bore Butter......
When it comes to CVA's you cant beat a powerbelt just to start off with.
295 grain aerotip with 80-90 grains Pyrodex seem like a good starting place. the 385 grain great plains conicals are another were to look at.
Maxi balls and hunters should also do good with 80 to 90 grains. I dont like them for hunting due to the bad performance i got on game, but if they shoot good on paper, thats all you'll need to get an idea on what it likes.