Yes, Cougar, I also wipe the bases of my cast bullets when handloading, and the bases of my .45 round noses are flat. However, I never carry them in the car until I'm on my way to the range. (I only use the reloads for practice; I use factory loads for defense.)
The reason I do this is because of one incident at the range. I took some recent vintage reloads to the range in Country Crock butter dishes on a very hot summer day. My friend and I took turns shooting and as I reached in the tub for more ammo, I noticed that the noses and some cases were 'slippery,' like the whole bucket had been dusted with WD-40. We had no misfires or stoppages.
Since the reloads had only been in the truck for transport and a few minutes at the range, I didn't think that prolonged storage was a good idea. I also know that lube, even commercial lube, is primarily an oil base and parafin. In the old days when we used to make our own lube we used a 50/50 mixture of vaseline and bee's wax.
To be fair, I have never contaminated a teaspoon of gunpowder and lube to see if it burned hotter or created a dud. I do believe that any accidental tampering with a load with melted lube is probably not a good idea. Even if the load only misfired it would be a hassle to pound a bullet out of a barrel.