Greetings My Good Dave
As you have found, Big Lube is the modernisch easy answer.
regarding the historicity , none of the Gov't's would not tolerate revolvers or rifles locking up due to fouling after 6 shots.
If WWCF-44-40 was still around he could answer you in a heartbeat. His studies into the topic were quite extensive,
including buying AND DISSECTING original cartridges, then working to duplicate them.
Working off the top of my head ( not a good choice today, but I will work at finding links later ) we can summarize from
Jack's work and John-Boys work and the Mad Monk's work that
it's the powder more than the gun:
- modern stuff fouls a lot
- old original premium powder hardly fouled at all
- Swiss is really good, others I have to check on.
- which lube is important, but I "think" I remember that for commercial stuff SPG is one of the best.
- humidity , compression, and crimp all have a factor. Drydock is right on:
The 454190 is one of my favorite bullets, and I've never had a problem with BP fouling while using it in my Colts or my Cimarron 7th Cav.
Where are you? Location, Humidity, altitude affect fouling. SPG is an excellent lube, but under some conditions it is not "wet" enough. I use Beeswax/Olive oil, with a higher percentage of oil in colder/dryer conditions. The army mix of Japan wax, mutton tallow and whale oil was noted as an excellent all weather lube.
- The other most important thing is the charcoal and the water being used to make the powder
Bill Knight found that Goex varied A LOT. At the worst the bean counters used crappy wood WITH THE BARK ON
for the charcoal; and badly polluted water and it sucked. The very best powders are typically made with pure spring water,
and carefully debarked premium wood such as alder or specific types of willow . Swiss follows a really good premium formula.
- original cartridges in .44 and .45 appear to have been loaded with 2F whilst many here use 3F. Differences? I dunno, I shoot
3F Goex and subs in C&B
- to achieve good results with modern stuff is a journey
hope this is at least entertaining,
hopefully more later as I find the links to the experts works.
prf mrvl