Howdy,
I bought a bunch of APP when it was called Cleanshot. My original intention was to use it for cartridges, and I did. .44 WCF, .45 Colt, .45-70, .38-55, .30-30... It worked pretty well, but I grew to dislike it and now use only FFg Goex and, in one cartridge, 777.
I found that the stuff absorbs moisture so quickly that an open jar will cake after only 15 minutes. How this stuff will act when stored in a flask, I shudder to speculate. I suspect that by the end of the day it won't pour at all.
While a by-product of combustion might actually be water vapor, it isn't enough to lubricate a dry bullet all the way down a rifle barrel. You will need to swab your bore after every ten shots or so. Also, the corrosive nature of APP practically stripped the "casehardened" finish from my .45 Vaqueros. Not good.
The one redeeming feature that it has is easy clean-up. I can run three wet patches down the bore, one dry, and oil. Done.
I would stay with Pyrodex or Goex.
Bitterroot