Yes, natural aging does rule...but it takes some patience to wait that long. Bloody Bess is in her third year, and she's just now getting "right". First two years I hunted mostly from blinds, and the weather was good, and it seemed like the patina was really taking it's time to set in. But this year I had some rainey days, plus walk-n-stalk hunted much more, (more handling with sweaty hands) and it really made a difference. She's really looking good.
The 1861 I just picked up was bright...VERY bright, people not very knowedgeable about ML's kept asking if it was stainless...!!! So I did lightly cold blue it, (VERY un-PC for a '61...I can hear the groans from the re-enactors right now!!) and am letting that fade to grey...as I will probably take it out in the field a few times this year, and really don't want to try and sneak up on a black bear with a chrome-looking gun...it was certainly as reflective as chrome!
When I got Bess as a kit, the barrel was not that highly polished like the 1861, so it was not as much as a problem.
So the cold-blue trick will work, but the natural process works better, looks better in the shorter long run. (?!?!?!) In the long-long run it's probably the same difference.
Rat