When I make lip balm, I melt the balm in these silicone egg poachers:
http://www.amazon.com/Fusionbrands-3-In ... 505&sr=8-1
I float the poachers in a pot of barely simmering water and melt the balm in them. When ready to pour, I take the poacher out of the pot and wipe the water off the outside with a cloth. As I'm gently patting the water off (which only takes a few seconds), I choose a side of the poacher that I'll pour the balm from, and then I squeeze the opposite sides of the poacher together in on that side so that it forms a lip or spout of sorts, and then I pour the melted balm into my tube. The poacher really makes for easy-peasy pouring with zero wastage.
I pour only 3/4 of the way up my tube at first, and then I place the poacher back into the pot to keep the remaining balm warm and melty while I stick my partially filled tube in the freezer. I keep it in the freezer for only a few minutes- just long enough until the balm sinks and hardens somewhat (but doesn't get too hard- very important). Then I take my tube out of the freezer and top it off, making sure to pour carefully so as to keep the surface tension of the melted balm intact so that it forms a nice dome on top, and then I let cool and harden up.
Needless to say, this procedure of mine will no doubt prove very tedious for those who are making large batches of balm at a time, but if you're making small batches like me (one to four balms at a time), it works quite nicely.