Year round BPC lube?

[Dances With Coyotes]

Some sort of wad or wax card would certainly help too right?

[Noz]

I'm a recent convert to Pearl Lube. Seems to work quite well both as a wad lube for the 1860s and a bullet lube for the 1866 in 44-40. 'course the 44-40 is a Mav Dutchman Big Lube.

[john boy]

The melt temp of PL-II is 120°F.  If my ammo gets above that, I expect the lube to start to melt.

Gents, let's look at this subject from factual points of view.  I offer the following:
*  What is the hottest temperature that you shoot in during the Summer?  
*  If the viscosity of the lube (ON AN EXPOSED GG) is less than the temperature you are shooting in - better change your lube
*  The melt temperature of a lube is the wrong way to determine which Summer lube you should be using
*  The correct temperature for a Summer lube is the VISCOSITY of the lube that stays in the GG's, specifically an EXPOSED GG because you can see if the lube is staying in the GG - thus it is staying in all the GG's.  The higher the viscosity, the better!

OK, is the melt temperature the correct method?  My vote is No.  One has to determine whether or not a given lube will 'stick' in a GG during hot weather with the loaded rounds still in the boxes?    It is the viscosity temperature of the lube.

So, how would one measure the viscosity of any given lube?
*  Meat thermometer and some lube in a small vial or container
*  Bring the temperature of the lube up to the point where it goes into a liquid state
*  Remove the container from the source of heat.  Put the thermometer in the lube and start stirring!
*  When the liquid state starts to cool down and goes into a viscous state and is the consistency of say, semi hard frosting on a cake ... measure the temperature.  A semi hard viscosity lube will adhere to the bullet in all the GGs.

I have 3 different concoctions of lubes that I use for different bullets shooting black powder.  The semi hard viscosity temperatures of each are:
A - 86 degrees F
B - 108 degrees F
C - 116 degrees F
I would offer that a composite of folks don't shoot in an outdoor temperature higher than the 86 degree one and if they do - the lube is too soft ... change to a higher viscosity temperature lube.  And as for an All Year Round Lube ... again viscosity determinant!

And always remember, black powder gases are 3200 degrees F (2300 2200 C) so it don't matter the temperature of the lube when you pull the trigger!