For cold weather patches, I have been using neatsfoot oil, for times ball will be loaded for a while.
Current experiment is for bullet lube/grease for bullets in a loading block. I did read an older thread on this topic and agree that holding loading block inside your shirt makes the question mainly moot.
None-the-less, I did this test today with crisco, bore butter, TC maxi lube, wonder lube and Blue & Gray. Gobs of each on foil then into freezer for a few hours.

Then poked at them with a toothpick (so no heat from my finger affecting pliability).
Crisco still soft and easy to spread.
Bore butter, TC maxi lube and wonder lube all hard as a rock, barely could I poke a dent in them with the toothpick.
Blue & Gray also soft and spreadable.
The TC maxi lube and Blue & Gray (which came in a big toothpaste like tube) were both old, like early 1980's old, so may not even be sold anymore.
Next week when deer season for me starts I plan to load my .54 jaeger with a round ball with neatsfoot oil patch. In the loading block I plan to have some Minies, in case I need to reload quick and easily. I think I will use the blue & gray this year.