The old rule of thumb does not always hang true but it used to be if the conical had a flat base, then you put a wonderwad between the bullet and the powder. If it had a hollow base you did not. Some people will pack a hollow base with bore butter before they shoot. I do not.

All you can do like Roskoe said is try the different combinations and see what happens. Some of my rifles like the wads and others hate them...