S'pose I might try that, Fleener - I've been using Lyman's BP gold and SPG along with 60:40 Beeswax/Vaseline, all great for a black powder. bullet lube.
Yes, I know Vaseline is a petroleum product, but in this mix for BP bullets, it works just as well as the commercial lubes mentioned.
Perhaps the synthesizing changes the Vaseline somewhat, but it sure works well, as noted.
I used this lube on 10, 200gr. R.E.A.L. bullets in my .45 flinter with 70gr. 2F in a row on paper at 50 meters, no wiping, then loaded a .445" ball and .022" denim patch without problem.
No crusty spots & no hard fouling at all.
I do not use BW in patch lube. I use either WWWF+ a tich of NF Oil for target shooting, or Track's Mink Oil or Neetsfoot oil for hunting.