Looking at the above, I don't doubt that the small group of UES (Unquestioned El Supremmo's)
can/have worked absolute magic w/ conventional lube/bullet/loading techniques
(Key word is "magic")
But I would venture that for 99-44/100th of the cast population, PC solves -- and
solves very well -- an incredible number of challenges that might not otherwise
be available to them.
(The art of "GoodEnough" is oft times the most difficult to acquire in all of human expedience)