What is not clear is the intent. 175Sierra does not state whether he is wanting to melt a complete, ready made, purchased, final product, commercial lube (like in tubular stick form) and simply melt it to a liquid form, for whatever is his purpose. We are assuming he is pan lubing cast bullets, but for all we know, he may be pouring melted lube into his sizer/lubricator in an attempt to eliminate some other perceived problem. He may also be wanting to create his own lube 'recipe' wherein he is melting and combining a variety of components that may have varying melting point temperatures. As was the case in his post on wanting to trade for a Lyman 'luber sizer', he does not make much effort toward explaining his thoughts, wants, and needs, and we are all guessing with our responses and 'answers'.
P.S. Edit: A little more explanation of the point I'm trying to make is, that simple questions, looking for simply answers can end up with 'unintended consequences'. Googling the subject will reveal all sorts of examples and 'answers', with a few cautions sprinkled in there. Some of the recipe components can have relatively low flash points so, low temps and slow melts seem to be the general consensus to avoid the possibility of igniting a fire and/or damaging the final product. Some say they have had less than acceptable results with a microwave, others like it. I think I would tend toward a 'defrost mode' rather than 'high' on a 1000 watt Micro, but that's just my cautionary side. Same with a 'Crock Pot'...low setting!