OK, I'm going to be the heretic here.
Over my 50 years of muzzleloading I've tried about every patch lube out there - spit, olive oil, peanut oil, mink oil, jojoba oil, Crisco/beeswax mix, etc.
For the last five years I've used nothing but Liquid Wrench Penetrating Oil for the patch lube in all of my guns, from .32 to .58 caliber. (OH, the horror! A petroleum product!) My powder of choice is GOEX.
I use precut patches, usually pillow ticking. I put a dozen or two patches in a stack - squirt the stack with enough LW to wet the patches pretty well - massage the stack with my fingers to distribute the oil evenly - wrap the stack in a paper towel and squeeze it so the towel absorbs the excess oil.
The patches will feel almost dry and are pleasant to handle. I get
excellent accuracy. No ugly fouling build up. Clean-up is just as easy as any other lube I've used. And as a bonus, no rust worries if I don't get around to cleaning the gun until the next day.
Don't hate me because I'm Semisane.
Try it, you might like it.