RE: Use WD/40 to clean muzzleloader?
I CAN tell you why WD-40 is not good on guns!! It tends to collect in areas like the insides of trigger mechanisms, etc., and, after the carrier evaporates, it gums up. Over a long period of time, this can be detrimental. Additionally, it is very penetrative, and kills powder and primer compounds very fast! There are document instances of dead ammo in police weapons attributable to WD-40, which came to attention during gunfights!!
Keep yore powder dry!!