Be quite carefull when melting beeswax. It is highly flamable. Most sources say that when making lubes, to melt them in a double boiler - can within a can of water.

Robert, considering the slugs are "all over the place", there is nothing lost in trying round balls. I'm quite certain that there were rifled choke guns made for round ball as well as for slugs. If it doesn't shoot one even reasonably well, perhaps the other will work. Nothing lost in trying.

Trackofthewolf.com sells round balls in a number of sizes. I found these useful in testing.
I still prefer to use an undersized ball, and a cup wad (or cloth patch to hold it centered and 'take' the rifling. The spin is perfectly transferred to the ball.

Note the middle row of 'loads'. They were more accurate than the bare balls, which engraved the rifling in this particular rifle barrel.