I'm not a 100% purist yet, plus I like the convenience of commercially made, readily availabile, proven lubes.
All I've ever used in and on all my rifles is Natural Lube 1000...prelube wonderwads, shooting patches, and cleaning / lubing patches.
Not only is it reliable and readily available in many forms and pre-lubed products, it lets me shoot a 50 round session at the range without ever having to wipe / clean the bore...whether using Goex in flintlocks or Pyrodex in percussions, to me that's an outstanding side benefit of Natural Lube 1000.
If / when I cross the line and decide to plunge into a total 100% traditional recreation of precisely how things were done way back during a specific era, I'll do my homework and meet that challenge...but for now, I just enjoy all the shooting I do every weekend through the year, plus hunting every weekend when the seasons are open, and Natural Lube 1000 does everything I need a good BP lube to do.