For my 575 or 577 Minies, which I shoot in a Musket, I use a mix of Beeswax and Crisco. A 50/50 mix works well, the warmer things are, use more beeswax.
I got my beeswax from Epay. This search will pull up beeswax and exclude a lot of unwanted items.
(beeswax, "beeswax block", "bees wax") -bracelet, -creme, -candle, -"candle" -, -necklace, -bangle, -turpentine, -pendant, -balm, -soap, -prayer,-tibet, -china, -chinese, -necklace, -candles, -deerskin